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Tim Tim is offline
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Default Boat and Batteries and Charging, Oh, my!

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...
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Default Boat and Batteries and Charging, Oh, my!

On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!
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Default Boat and Batteries and Charging, Oh, my!

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


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Default Boat and Batteries and Charging, Oh, my!

On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P." wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


Tim should be able to jump all over that one!

Go Tim!
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!
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Default Boat and Batteries and Charging, Oh, my!

On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


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Default Boat and Batteries and Charging, Oh, my!

On 3/15/2016 4:22 PM, wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?
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Default Boat and Batteries and Charging, Oh, my!

On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM, wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.
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Default Boat and Batteries and Charging, Oh, my!

On 3/16/2016 10:36 AM, wrote:
On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM,
wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.


I'll throw a volt meter on the battery and make sure the charging
system is working properly when I take her out of storage in a few
weeks. A battery switch is pretty simple to install... If its really
producing 9amps, that should be more than enough to keep the house
battery alive if I let it charge while pulling kids on the tube or whatever.
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Default Boat and Batteries and Charging, Oh, my!

On 3/16/2016 9:01 AM, Ryan P. wrote:
On 3/15/2016 4:22 PM, wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim
wrote:

"
Without an alternator, though, I'm worried about leaving it at a
slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it
might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Nope. The starter will draw on the battery, and combining batteries
wouldn't be the best thing to do if one of them has a shorted cell or is
grossly depleted. Best thing to do is use a battery selector switch.
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Default Boat and Batteries and Charging, Oh, my!

Ryan P.
- show quoted text -
"I'm the one asking the stupid questions, I'm sure. *I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. *Its a 1985 Mercury 75.
* I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs? "

Four years ago I had an open tiller boat with a 30hp Johnson. The motor had an electric start but no charging system.
No radio but it had a MinnKota trolling motor. The idea was to charge the battery with a small charger at the end of each boating day. I think it would have been just as easy to take the boat out of the water and trailer to motel for charging than dig the heavy battery out and do same. BTW..I'd forget about the radio...I could start the 30 with a pull cord but your 70 might be a different matter.



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