1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

Check for bad connections. Corrosion starts to cause high resistance
after years.

Robk1013 wrote:
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

"Robk1013" wrote in message
ps.com...
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

Most of that stuff is daisy chained. Hint: The panel lights and instruments
usually share the same grounds. If the panel lights work on those gauges,
the problem is most likely with the +12v.
Jim

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

The panel lights all work, I had the boat out last night. All fuses
check ok. I am assuming the gauges has the feed from sending unit, a
12 volt source and a ground
Jim wrote:
"Robk1013" wrote in message
ps.com...
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

Most of that stuff is daisy chained. Hint: The panel lights and instruments
usually share the same grounds. If the panel lights work on those gauges,
the problem is most likely with the +12v.
Jim

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

Yes, I'd check the 12v and grounds first.

Robk1013 wrote:
The panel lights all work, I had the boat out last night. All fuses
check ok. I am assuming the gauges has the feed from sending unit, a
12 volt source and a ground
Jim wrote:
"Robk1013" wrote in message
ps.com...
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

Most of that stuff is daisy chained. Hint: The panel lights and instruments
usually share the same grounds. If the panel lights work on those gauges,
the problem is most likely with the +12v.
Jim

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

"Robk1013" wrote in message
oups.com...
The panel lights all work, I had the boat out last night. All fuses
check ok. I am assuming the gauges has the feed from sending unit, a
12 volt source and a ground
Jim wrote:
"Robk1013" wrote in message
ps.com...
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

Most of that stuff is daisy chained. Hint: The panel lights and
instruments
usually share the same grounds. If the panel lights work on those gauges,
the problem is most likely with the +12v.
Jim

It just occurred to me that you may be powering your panel lights from the
ignition switch. In that case the gauge and panel light hot wires are
probably joined together. Why don't you try grounding the sender leads at
the senders. They should peg the meters. If nothing happens try again
grounding the sender wires at the back of the meters. Careful, there's 12V
there.
Jim

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

Ok I will try tonight, thanks for the help

Bpb
Jim wrote:
"Robk1013" wrote in message
oups.com...
The panel lights all work, I had the boat out last night. All fuses
check ok. I am assuming the gauges has the feed from sending unit, a
12 volt source and a ground
Jim wrote:
"Robk1013" wrote in message
ps.com...
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

Most of that stuff is daisy chained. Hint: The panel lights and
instruments
usually share the same grounds. If the panel lights work on those gauges,
the problem is most likely with the +12v.
Jim

It just occurred to me that you may be powering your panel lights from the
ignition switch. In that case the gauge and panel light hot wires are
probably joined together. Why don't you try grounding the sender leads at
the senders. They should peg the meters. If nothing happens try again
grounding the sender wires at the back of the meters. Careful, there's 12V
there.
Jim

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

I grounded the sending wire and the needle went all the way to empty
from all the way full with about 1/4 tank of gas (verified through the
snding unit cover). I then jumped the sending wire still installed to
the gauge to the +12V side and the gauge started to flutter slightly in
the empty position moving very fast but not far. I also hoooked up the
meter from the sending unit to groung and rocked the boat to see if I
had resistance #1 and #2 to see if resistance changed while the fuel
was moving. It appears the sending unit is good. From what you told
me I expect it is the gauge that is faulty

Bob
Jim wrote:
"Robk1013" wrote in message
oups.com...
The panel lights all work, I had the boat out last night. All fuses
check ok. I am assuming the gauges has the feed from sending unit, a
12 volt source and a ground
Jim wrote:
"Robk1013" wrote in message
ps.com...
Has anyone had a similiar issue with gauges not working, both the fuel
and temp are not working. I do have a meter and looking for a few
troubleshooting techniques.

Thanks

Robert

Most of that stuff is daisy chained. Hint: The panel lights and
instruments
usually share the same grounds. If the panel lights work on those gauges,
the problem is most likely with the +12v.
Jim

It just occurred to me that you may be powering your panel lights from the
ignition switch. In that case the gauge and panel light hot wires are
probably joined together. Why don't you try grounding the sender leads at
the senders. They should peg the meters. If nothing happens try again
grounding the sender wires at the back of the meters. Careful, there's 12V
there.
Jim

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

Here's a link to everything you need to know about 90% of the fuel
level systems on small crafts.

http://ww2.tflx.com/pdf/marfue%7E1.pdf

(You'll need Acrobat Reader to view)

Armed with a couple of jumper wires alligator clips, an Volt/Ohm Meter,
and a potentiometer (variable resistor) you can diagnose just about all
of your gauges. The fuel gauge is in my opinion the easiest as you can
take the fuel sender out and test it by moving the float up and down
while hooked up to an ohm meter and see if it's sending the right
signal. Full or in the up position should read 30 ohms and Empty or
down position should read 240+/- ohms.

If that checks ok, while you're still at the fuel sending unit, using a
0-500 ohm variable resistor (I picked a 10 turn up at radio shack for
$8) hook it up to the ground and pink leads going to the sending unit
(Unhook them from the sending unit of course) and move it from 0-300+
ohms. This should move the gauge wherever you want it. (Don't forget
that the key will probably have to be in the on position to give power
to the gauge)

If the gauge isn't moving like it should, move up to the gauge itself.
Find a good ground for one jumper and the post that the sender feeds
into the gauge, usually a pink or red wire. Using the variable resistor
again, see if you can move the gauge by changing the resistance. If
not, you need to make sure the gauge has a good ground and that the
purple wire is feeding the gauge 12v.

Hope this helps!

Joe

1994 Bayliner capri 1750 Merc 3.0L fuel gage will not work
 

"Robk1013" wrote in message
oups.com...
I grounded the sending wire and the needle went all the way to empty
from all the way full with about 1/4 tank of gas (verified through the
snding unit cover). I then jumped the sending wire still installed to
the gauge to the +12V side and the gauge started to flutter slightly in
the empty position moving very fast but not far. I also hoooked up the
meter from the sending unit to groung and rocked the boat to see if I
had resistance #1 and #2 to see if resistance changed while the fuel
was moving. It appears the sending unit is good. From what you told
me I expect it is the gauge that is faulty

Bob

If you grounded the sending wire at the sending unit and you got the meter
to peg, either your sending unit is bad or there is something wrong with the
ground at the sending unit. You should not have put 12V on the sender wire
on the gauge. The gauge might be damaged now, but hopefully not. Test the
gauge by touching a ground wire to the sending post on the gauge. I hope I'm
making myself clear to you. If not, lets talk some more before you proceed.
Jim