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Old 03-06-2016, 08:38   #1
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Bad Solenoid Wiring?

I am novice cruiser/live aboard, I am seeking the wisdom of the mechanically inclined sages of this board. I bought a Hunter 336 (built in 1995/96) the electrical/battery area was recently redone but wiring in helm station all appear to be original. The boat is equipped with a Yanmar 3GM engine that has low hours on it. So here is the problem if the boat is not on shore power the engine has problems starting. I have a portable Honda generator and can get starter battery to over 12.50 volts. Still this seems to be just short of the current needed to get the engine going, but after a night on shore power 30 amp shore power it will start. I read a bit on a Hunter site that the gauge wiring from solenoid to starter isn't heavy enough and over time will not deliver the proper charge. Just looking for confirmation if this sounds correct. Because spending weekend stuck of a private Bahama Island was an adventure but would like to have been able to leave once started getting sideway looks from the restless natives!

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Old 03-06-2016, 08:51   #2
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Re: Bad Solenoid Wiring?

Pretty common problem on many starters, especially GM V8s, the wiring from the starter switch to the starter solenoid is too wimpy. Upgrade the wiring or go to an auto parts store and get the aftermarket relay kit to upgrade the system.
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Old 03-06-2016, 09:22   #3
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Location: Grand Manan,N.B.,Canada N44.40 W66.50
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Re: Bad Solenoid Wiring?

Suggest always carry a set of decent quality jumper cables.
They are handy for paralleling, etc wiring for one thing.
My personal experience & humble opinions-feel free to ignore both
Remember-If all else fails, Google is your friend.
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Old 04-06-2016, 17:37   #4
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Re: Bad Solenoid Wiring?

My setup has the key switch to a relay (headlight type?) at the engine which THEN goes to the starter solenoid.
Suspect the battery has dropped a cell? What is battery volts after overnight resting? (no use & no input) Any sign of wet on top of the battery? Just on top of one cell?
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Old 05-06-2016, 15:30   #5
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Re: Bad Solenoid Wiring?

Off hand I would think a bad battery and or altinator. All night on shore line and charger ok but not when unplugged. Take the battery to a battery place and have it checked. Then go from there. A battery at 12 volts is dead
That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
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