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post #9 of Old 01-18-2014
Maine Sail
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Re: Engine start shuts off chartplotter

The problems are / could be:

1- Aged batteries beyond their useful life. No healthy 500+ Ah GEL battery bank should EVER drop electronics even at 50% SOC when starting a 4J Yanmar.. Something is simply wrong...

2- Poor wiring or connections creating undue voltage drop during starting. The best place for an engine negative connection is directly to the mounting bolt for the starter itself.. This helps minimize passing hundreds of amps through paint, dissimilar poor conducting metals and rust.

3- Poor choice of DC loads tie in to the system wiring...

4- Undersized wiring, poorly executed terminations or poorly wired batteries...

Three healthy GEL 8D's should barely dip starting a Yanmar 4J. This is absolute cake walk for them and you should be seeing a bare minimum of 4000 cranking amps at normal cruising temps!!!!

Clean all connections, move the negative to the bolt that holds the starter to the engine (buy a longer bolt if necessary) and let us know how that worked.......

-Maine Sail / CS-36T

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