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post #9 of Old 09-03-2012 Thread Starter
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Re: Enging/starter battery pretends to be good but....

Originally Posted by hellosailor View Post
Did your crew chief ever say something like "All you fly boys better bring my airplane back in one piece!" ?

If the battery is good and the engine won't start, the diagnostics are always the same. Check battery, check wiring, check starter. One or more of those will be bad. If you get it to the point where the starter spins up the motor but it just doesn't fire up--then you've got engine problems. If it doesn't spin up:

Check battery, check wiring, check starter.

Quick check, carefully use jumper cables to directly connect the starter to the battery. If it spins up, you've got a wiring problem. Loose or corroded wiring usually. If it doesn't spin up--off the starter goes for a bench test.
I've done the "quick check" and it started right up. I've eliminated some issues, cleaned up a bit of the connections though they looked really clean. I'm just working through the system hoping to stumble across it. I do NOT think the alternator was sending voltage to the house? I think something is draining the starter battery during normal day to day use and the trickle charger can't keep up the charge--hence the no start from the engine battery. The condition of the wiring et al seems pretty good, I just think a mistake was made in the setup and am trying to find it. For example with the engine running why no alternator voltage to the house? That's totally contrary to most setups

F15E_WSO + 1
Deale Md, to Caribbean Oct 2012-Aug 2013
Boat Type Irwin 43 Mk III Center Cockpit--Sold it
Boat Yr, 1989
Boat Length 43'

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