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#1
posted to rec.boats
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green ground wire
I bought a 1996 sea ray f-16 jet boat last summer and the seller said
the engine had recently been rebuilt. I noticed that the fuel gauge did not work when I bought the boat so this week I decided to replace both the fuel level sender in the tank and the fuel gauge. The new fuel gauge still does not work. In trying to figure out why the gauge does not work, I noticed the fuel tank had a green wire attached to it and the other end of the green wire was connected to the engine block at the same point where the battery +12 volt line is connected to the input of the starter solenoid. Because of this, the fuel tank is always +12 volts. I verified this with a volt meter that the tank is +12 Volts. This is apparently why the fuel sender is not working since their is no ground for the sensor. My question is this. Should I disconnect the green wire from the input to starter solenoid where the +12 V line is attached, and connect the green wire to where the battery negative black wire is connected on the engine block? I'm assuming that when the engine was put back into the boat someone connected the green wire in the wrong place. The boat worked fine all summer so the tank at +12 volts did not cause any problems other than the fuel gauge malfunction. Thanks for your help. |
#2
posted to rec.boats
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green ground wire
"bobk123" wrote in message ups.com... I bought a 1996 sea ray f-16 jet boat last summer and the seller said the engine had recently been rebuilt. I noticed that the fuel gauge did not work when I bought the boat so this week I decided to replace both the fuel level sender in the tank and the fuel gauge. The new fuel gauge still does not work. In trying to figure out why the gauge does not work, I noticed the fuel tank had a green wire attached to it and the other end of the green wire was connected to the engine block at the same point where the battery +12 volt line is connected to the input of the starter solenoid. Because of this, the fuel tank is always +12 volts. I verified this with a volt meter that the tank is +12 Volts. This is apparently why the fuel sender is not working since their is no ground for the sensor. My question is this. Should I disconnect the green wire from the input to starter solenoid where the +12 V line is attached, and connect the green wire to where the battery negative black wire is connected on the engine block? I'm assuming that when the engine was put back into the boat someone connected the green wire in the wrong place. The boat worked fine all summer so the tank at +12 volts did not cause any problems other than the fuel gauge malfunction. Thanks for your help. Yes. |
#3
posted to rec.boats
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green ground wire
Short Wave Sportfishing wrote:
On 20 Nov 2006 19:26:53 -0800, "bobk123" wrote: 1 - Are you sure that's a ground wire? 2 - Are you sure it's not a bad sender? If both of the above it yes, then by all means. Yes to number 2 and but not sure about number 1 question. I checked the sender and gauge off the boat by hooking it up to just the 12 volt battery and they worked fine. As far as the ground question, the green wire is attached to the tank at a welded strap on the tank. Also connected to this strap besides the green wire is a black ground wire for the fuel sending unit. From what I read in this forum a heavy gauge green wire is normally an earth ground wire and used for ground when connected to shore AC power. I don't have AC on this boat just 12 V DC current so I'm not sure why a green wire is on this small 16 ft boat. |
#4
posted to rec.boats
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green ground wire
"Short Wave Sportfishing" wrote in message ... On 21 Nov 2006 04:28:26 -0800, "bobk123" wrote: Short Wave Sportfishing wrote: On 20 Nov 2006 19:26:53 -0800, "bobk123" wrote: 1 - Are you sure that's a ground wire? 2 - Are you sure it's not a bad sender? If both of the above it yes, then by all means. Yes to number 2 and but not sure about number 1 question. I checked the sender and gauge off the boat by hooking it up to just the 12 volt battery and they worked fine. As far as the ground question, the green wire is attached to the tank at a welded strap on the tank. Also connected to this strap besides the green wire is a black ground wire for the fuel sending unit. From what I read in this forum a heavy gauge green wire is normally an earth ground wire and used for ground when connected to shore AC power. I don't have AC on this boat just 12 V DC current so I'm not sure why a green wire is on this small 16 ft boat. Ok, so I assume you removed the sender and checked it - good. Now that wire run should be duplicated on your boat in exactly the same way you tested it. The way you would do that is to ring out the wires from the gauge to their termination points at the tank. Find the power leads and that should be that. Greenwire is normally associated with ground in AC systems, but not DC systems. I assume that your 16 foot boats is probably all DC and no AC available. So my thinking on the issue is that you need to find the black ground wire, or just rewire the gauge/sender as you tested it and just disconnect anything you can't readily identify from the tank. That extra wire could be a work around for some other accessory on the boat that was removed, but it could be an active ground. I would just ground it to whatever point is closest on the engine block. Green is usually the color for bond except in the case of Eisboch's Volvos. You should find thay all of the green wires are tied together at the engine, common bonding plate, or at least to a dynoplate. Eisboch will correct me if I'm wrong. Jim |
#5
posted to rec.boats
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green ground wire
Jim wrote: "Short Wave Sportfishing" wrote in message ... On 21 Nov 2006 04:28:26 -0800, "bobk123" wrote: Short Wave Sportfishing wrote: On 20 Nov 2006 19:26:53 -0800, "bobk123" wrote: 1 - Are you sure that's a ground wire? 2 - Are you sure it's not a bad sender? If both of the above it yes, then by all means. Yes to number 2 and but not sure about number 1 question. I checked the sender and gauge off the boat by hooking it up to just the 12 volt battery and they worked fine. As far as the ground question, the green wire is attached to the tank at a welded strap on the tank. Also connected to this strap besides the green wire is a black ground wire for the fuel sending unit. From what I read in this forum a heavy gauge green wire is normally an earth ground wire and used for ground when connected to shore AC power. I don't have AC on this boat just 12 V DC current so I'm not sure why a green wire is on this small 16 ft boat. Ok, so I assume you removed the sender and checked it - good. Now that wire run should be duplicated on your boat in exactly the same way you tested it. The way you would do that is to ring out the wires from the gauge to their termination points at the tank. Find the power leads and that should be that. Greenwire is normally associated with ground in AC systems, but not DC systems. I assume that your 16 foot boats is probably all DC and no AC available. So my thinking on the issue is that you need to find the black ground wire, or just rewire the gauge/sender as you tested it and just disconnect anything you can't readily identify from the tank. That extra wire could be a work around for some other accessory on the boat that was removed, but it could be an active ground. I would just ground it to whatever point is closest on the engine block. Green is usually the color for bond except in the case of Eisboch's Volvos. You should find thay all of the green wires are tied together at the engine, common bonding plate, or at least to a dynoplate. Eisboch will correct me if I'm wrong. Jim Making an assumption that this 16 foot boat spends 95% of its time hauled out and sitting on a trailer and only 5% of its time afloat, I don't know why a bonding system would be all that important. The risk of electrolytical activity is only present ro any meaningful degree when the boat is in the water, and then it's normally a *very* slow process. Sacrificial anodes for the drive, risers, and heat exchager should be sufficient, I would think. |
#6
posted to rec.boats
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green ground wire
"Jim" wrote in message ink.net... Green is usually the color for bond except in the case of Eisboch's Volvos. You should find thay all of the green wires are tied together at the engine, common bonding plate, or at least to a dynoplate. Eisboch will correct me if I'm wrong. Jim That's how I understand it. Eisboch |
#7
posted to rec.boats
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green ground wire
"Chuck Gould" wrote in message oups.com... Jim wrote: "Short Wave Sportfishing" wrote in message ... On 21 Nov 2006 04:28:26 -0800, "bobk123" wrote: Short Wave Sportfishing wrote: On 20 Nov 2006 19:26:53 -0800, "bobk123" wrote: 1 - Are you sure that's a ground wire? 2 - Are you sure it's not a bad sender? If both of the above it yes, then by all means. Yes to number 2 and but not sure about number 1 question. I checked the sender and gauge off the boat by hooking it up to just the 12 volt battery and they worked fine. As far as the ground question, the green wire is attached to the tank at a welded strap on the tank. Also connected to this strap besides the green wire is a black ground wire for the fuel sending unit. From what I read in this forum a heavy gauge green wire is normally an earth ground wire and used for ground when connected to shore AC power. I don't have AC on this boat just 12 V DC current so I'm not sure why a green wire is on this small 16 ft boat. Ok, so I assume you removed the sender and checked it - good. Now that wire run should be duplicated on your boat in exactly the same way you tested it. The way you would do that is to ring out the wires from the gauge to their termination points at the tank. Find the power leads and that should be that. Greenwire is normally associated with ground in AC systems, but not DC systems. I assume that your 16 foot boats is probably all DC and no AC available. So my thinking on the issue is that you need to find the black ground wire, or just rewire the gauge/sender as you tested it and just disconnect anything you can't readily identify from the tank. That extra wire could be a work around for some other accessory on the boat that was removed, but it could be an active ground. I would just ground it to whatever point is closest on the engine block. Green is usually the color for bond except in the case of Eisboch's Volvos. You should find thay all of the green wires are tied together at the engine, common bonding plate, or at least to a dynoplate. Eisboch will correct me if I'm wrong. Jim Making an assumption that this 16 foot boat spends 95% of its time hauled out and sitting on a trailer and only 5% of its time afloat, I don't know why a bonding system would be all that important. The risk of electrolytical activity is only present ro any meaningful degree when the boat is in the water, and then it's normally a *very* slow process. Sacrificial anodes for the drive, risers, and heat exchager should be sufficient, I would think. Might be important to bond the gas filler assy. Might be important to bond the jet. Anodes are good to have but they serve a different purpose. This would be a good topic for you to research for an article in your boating periodical. Jim |
#8
posted to rec.boats
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green ground wire
Short Wave Sportfishing wrote:
On 21 Nov 2006 04:28:26 -0800, "bobk123" wrote: Short Wave Sportfishing wrote: On 20 Nov 2006 19:26:53 -0800, "bobk123" wrote: Ok, so I assume you removed the sender and checked it - good. Now that wire run should be duplicated on your boat in exactly the same way you tested it. The way you would do that is to ring out the wires from the gauge to their termination points at the tank. Find the power leads and that should be that. Greenwire is normally associated with ground in AC systems, but not DC systems. I assume that your 16 foot boats is probably all DC and no AC available. So my thinking on the issue is that you need to find the black ground wire, or just rewire the gauge/sender as you tested it and just disconnect anything you can't readily identify from the tank. That extra wire could be a work around for some other accessory on the boat that was removed, but it could be an active ground. I would just ground it to whatever point is closest on the engine block. Yes, the boat is in the water only about 5% of the time. I think the sending unit will work once I ground the fuel tank because the sending will then have a ground instead of the +12 volts. I'll attach the green wire to the engine block first and see if the sending unit will work. If not then I'll rewire as you suggested. Thanks all for your help. |
#9
posted to rec.boats
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green ground wire
All major components on a boat should be electrically bonded
together. This is especially important to human safety. Your gas tank is electrically floating? Then it is a situtatoin similar to what destroyed a 707 over Elkton MD. That is dangerous. Gas tank should be grounded using a 10 AWG (or heavier) ground wire so that engine, tank, and all other major metal components are bonded electrically and so that bonding makes a connection to water. A discussion of this concept: http://www.thomson.ece.ufl.edu/lightning/ Summary http://www.thomson.ece.ufl.edu/lightning/IEEE.pdf IEEE paper http://www.thomson.ece.ufl.edu/lightning/video.html Video Apparently that gas gauge problem is but a symptom of a more dangerous and serioius problem. bobk123 wrote: I bought a 1996 sea ray f-16 jet boat last summer and the seller said the engine had recently been rebuilt. I noticed that the fuel gauge did not work when I bought the boat so this week I decided to replace both the fuel level sender in the tank and the fuel gauge. The new fuel gauge still does not work. In trying to figure out why the gauge does not work, I noticed the fuel tank had a green wire attached to it and the other end of the green wire was connected to the engine block at the same point where the battery +12 volt line is connected to the input of the starter solenoid. Because of this, the fuel tank is always +12 volts. I verified this with a volt meter that the tank is +12 Volts. This is apparently why the fuel sender is not working since their is no ground for the sensor. My question is this. Should I disconnect the green wire from the input to starter solenoid where the +12 V line is attached, and connect the green wire to where the battery negative black wire is connected on the engine block? I'm assuming that when the engine was put back into the boat someone connected the green wire in the wrong place. The boat worked fine all summer so the tank at +12 volts did not cause any problems other than the fuel gauge malfunction. Thanks for your help. |
#10
posted to rec.boats
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green ground wire
"w_tom" wrote in message ups.com... All major components on a boat should be electrically bonded together. This is especially important to human safety. Your gas tank is electrically floating? Then it is a situtatoin similar to what destroyed a 707 over Elkton MD. That is dangerous. Gas tank should be grounded using a 10 AWG (or heavier) ground wire so that engine, tank, and all other major metal components are bonded electrically and so that bonding makes a connection to water. A discussion of this concept: http://www.thomson.ece.ufl.edu/lightning/ Summary http://www.thomson.ece.ufl.edu/lightning/IEEE.pdf IEEE paper http://www.thomson.ece.ufl.edu/lightning/video.html Video Apparently there are some exceptions to what is bonded and what is not. My boat is equipped with Volvo diesels and Volvo purposely does not bond the engine, shaft and props to the boat's common bonding system. The reason is to reduce electrolysis due to DC leakage. I found this out when the boat was modified with thrusters. The installer connected the thruster housings and motors to dedicated batteries that where also connected to the main batteries for charging. He also connected the thruster motors to the bonding system. It was discovered during regular in-water hull cleaning by the diver who noticed "tingling" when he touched the shafts or props. Disconnecting shore power plus a host of other experiments did not get rid of the tingle, which was very mild, BTW ... he could feel it if he brushed a shaft or prop with the back of his hand. A call to Volvo provided the explanation of why the engines and shafts were not bonded. I disconnected the thruster batteries from the mains and the "tingling" went away. Ended up installing a separate, dedicated charging system for the thruster batteries. All bronze thru fittings, etc. are bonded. Interestingly, the electronics (radar, etc.) is obviously grounded to the batteries via the DC power return, but they are *not* bonded. So, on my boat, red is 12vdc positive, black is 12vdc negative and green is bond. Eisboch |
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