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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > Enging/starter battery pretends to be good but....
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Thread: Enging/starter battery pretends to be good but.... Reply to Thread
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Topic Review (Newest First)
09-10-2012 12:57 AM
davidpm
Re: Enging/starter battery pretends to be good but....

What was that .1 amp draw?
09-09-2012 10:35 PM
asdf38
Re: Enging/starter battery pretends to be good but....

Quote:
Originally Posted by hellosailor View Post
No, bill usually means exactly what he's said. I read it that when he says the STARTER he means the starter, especially in the context. No reason to read it as meaning the starting battery, that seems clear if you understand how starting systems misbehave.
I wasn't questioning bill...I was questioning his interpretation of what F15EWSO said which I think was confusing. I agree with Bill 100% that if the engine starts under some battery conditions then the problem isn't likely the starter. That's why I think F15EWSO meant starter battery when he said "Dave" from the yard had one "lying around".
09-08-2012 06:19 PM
hellosailor
Re: Enging/starter battery pretends to be good but....

No, bill usually means exactly what he's said. I read it that when he says the STARTER he means the starter, especially in the context. No reason to read it as meaning the starting battery, that seems clear if you understand how starting systems misbehave.
09-08-2012 03:58 PM
asdf38
Re: Enging/starter battery pretends to be good but....

Quote:
Originally Posted by btrayfors View Post
A flaky solenoid is another possibility; the starter itself is not necessarily the problem, especially since you can start the engine under certain battery/switch positions.

Bill
I assume he means starter battery when he says starter. I was confused the first time reading it as well.
09-07-2012 12:45 AM
btrayfors
Re: Enging/starter battery pretends to be good but....

Did Dave measure the voltage AT THE STARTER SOLENOID under both conditions?

Changing out the starter before you do this -- to eliminate the (very real) possibility of a faulty battery switch and/or connections -- is the last thing I'd want to do.

A flaky solenoid is another possibility; the starter itself is not necessarily the problem, especially since you can start the engine under certain battery/switch positions.

Bill
09-06-2012 10:33 PM
F15EWSO
Re: Enging/starter battery pretends to be good but....

Update and thanks to all for inputs.

Got "Dave" from the yard to come aboard and we sorted it out in about 3/4 of an hour. The PO made a mistake when putting in the new house batteries; fixed that and that solved the alternator issue to the house bank. There is/was something pulling .1 amp/hr off the starter battery so moved that to the house and will run that down later. Today the engine would not start off the "starter" battery even with a full charge so Dave thinks it is the starter. It would start off of the "all" setting of the Perko(s). Dave gave me a starter he had lying around to try that and see if it fixes the problem. Tomorrow's project along with engine mounts, should be a fun day.
09-05-2012 05:11 PM
MarkSF
Re: Enging/starter battery pretends to be good but....

I used Permatex anti-sieze grease, on the basis it has copper and aluminium in it, which should be conductive. Yes, it was the only thing that was handy.
09-05-2012 05:01 PM
hellosailor
Re: Enging/starter battery pretends to be good but....

"A cleanup of all the battery connections and application of some dielectric grease and it starts up perfectly."
It took me a while but I've gotten in the habit of greasing all sorts of connections, including the battery contacts in flashlights. When they leak it makes the cleanup way easier. So far the cheapest cource for dielectric grease that I've found is the auto parts store. "High temperature brake grease" about $4 for a toothpaste-tube size.

"take your watch off, "
Heheh. We won't mention the bezel that almost got welded in place here. Welcome to the club.
09-05-2012 03:26 PM
MarkSF
Re: Enging/starter battery pretends to be good but....

Just wanted to mention my experience last weekend - the engine started great on bank 1, but not on bank 2.

I check the bank 2 batteries, they measured fine. But still the starter went grrrrr grrrrr.

So I selected bank 2, and switched on every light in the boat, so I was pulling about 20 amps. I then started measuring voltage drops. Luckily, I started at the battery end.

I had a drop of 0.5V between the battery post, and the the cable clamped to it. Also feeling the cable clamp showed it to be getting distinctly warm, just at 20A draw.

So a drop of 0.5V at 20A would be a drop of 5V at 200A starting current. So that's why the engine was not starting. BTW, at that kind of resistance and voltage drop, something in your system should be getting VERY hot.

A cleanup of all the battery connections and application of some dielectric grease and it starts up perfectly.

BTW, a good habit when working on 12V systems especially around batteries is to take your watch off, especially if it has a metal strap.
09-05-2012 11:57 AM
asdf38
Re: Enging/starter battery pretends to be good but....

Quote:
Originally Posted by hellosailor View Post
Given the cost of an alleged pro, and the value of "I know we did it this way, I know where that is", I might disagree on trying to find a pro unless there was a time crunch.

The basics of good 12v boat wiring are documented so well, in so many books (which are way more comprehensive than poking around web sites) that they aren't hard to pick up. Similarly the tools are readily available. The only caveat there, is that a proper battery cable lug crimper is a damned expensive tool, the alternative to that is ordering cables premae from someplace like genuinedealz, who are a true bargain.
Right I agree and I don't know if I've ever suggested going to a pro before but this guy splashed his boat and wanted to sail it away. He also appears to be pretty new with electrical stuff. I maybe reading into those two things incorrectly but it makes me think a pro isn't a bad option.

My own re-wire project spanned 2 years and 100's of hours in the boat and off it... I think I still have some issues with the engine harness that aren't presenting themselves right now and I absolutely dread having to debug them...so I feel for the op.
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