Starting Circuit Mystery (why won't my engine crank?) - Page 3 - SailNet Community
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post #21 of 50 Old 08-15-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

If you connect a 12 load to the solenoid and the starter motors works... it means your solenoid works.

Now connect the 12 v wire to the wire that runs from the start switch to the solenoid AT the solenoid end. If it starts... that wire is OK. And it sounds like your switch is not working. Jump the wire of the switch and if it starts that will confirm whether the switch is toast.
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Re: Starting Circuit Mystery (why won't my engine crank?)

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Originally Posted by bristol299bob View Post
for the solenoid circuit you can measure the amp draw at the push button ... it would be fairly easy solo and the values would be the same as "at the solenoid".
So, I managed to try this before the storm rolled in ...

And I see no amp draw when the button is pushed. Weirder and weirder. Hopefully the rain will blow itself out over night and I can do some more testing in the morning ...
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Re: Starting Circuit Mystery (why won't my engine crank?)

Load test your start button circuit with a cheap fog light.
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Re: Starting Circuit Mystery (why won't my engine crank?)

Since i was a youngin and encountering elec problems, disconnecting and massaging with sandpaper gave good results...usually the prob.
And requires little brain power.
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post #25 of 50 Old 08-15-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

If you do an internet search for 3gm30 starter problems (which apparently were quite common0 you may be able to find several suggestions that are applicable to your situation. One common fix was to bypass the harnesses that had become corroded over the years and to install a secondary solenoid close to the engine that solves the current loss problem.
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post #26 of 50 Old 08-16-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

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Originally Posted by overbored View Post
you are carrying a remote switch to be able to start the engine in a hurry why not just wire in the remote switch so you don't have to spend the time to connect it in a hurry. I was thinking of buying a second boat to tow behind so I would have a spare part for every thing on the boat with me.
I prefer a portable remote switch instead of another installed system which could fail for the same reasons the start system failed. KISS, lol.
Plus, for those of us operating gensets as well as main engines, it can be used with either, or for those of you with cars....

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post #27 of 50 Old 08-16-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

Most boats have a remote switch already.

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post #28 of 50 Old 08-16-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

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Originally Posted by SeanM26 View Post
Most boats have a remote switch already.

Good enough in an emergency for sure, if you don't mind having it welded to your solenoid!
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post #29 of 50 Old 08-16-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

If you're having to use the screw driver long enough to weld it to the solenoid You've got bigger problems.
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post #30 of 50 Old 08-16-2019
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Re: Starting Circuit Mystery (why won't my engine crank?)

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Originally Posted by capta View Post
Another thing in this line of discussion. Each of us should carry a remote start switch as pictured below to start the engine should the starting circuit fail. This can happen off the dock and if you have the remote start switch, it's less than a minute to hook it up and get the engine going!
Interesting suggestion. Not sure it will work on all engines, though. Some have electronic fuel shut off, some big boys even electronic injection timing. If you're not getting power through the start switch, these may be disabled as well. Still, cheap accessory and worth having.

I know of one guy, whose starter motor failed. He brought a halyard down through the companionway, wrapped it around the main balancing wheel, like a lawn mower pull cord, and cranked away. I heard the story from a crew member who claimed it worked. It was aboard Bob Seager's boat. Yes, that Bob Seager.


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