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posted to rec.boats
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First recorded activity by BoatBanter: Aug 2015
Posts: 1,244
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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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