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  Electric Starter Motor Won't Engage

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Author Topic:   Electric Starter Motor Won't Engage
jbrobinson33 posted 04-04-2015 06:44 PM ET (US)   Profile for jbrobinson33   Send Email to jbrobinson33  
I have 1994 Boston Whaler Rage 15 with an OMC Turbo Jet 115 motor. A couple of years ago I replaced the mechanical fuel pump with an electric one. Everything has been working great until now. I was starting it up the other day and everything was going along normally: fuel pump engaged, motor turned over, fired, then everything stopped and the fuel gauge pegged beyond full. (The fuel gauge was working normally until this moment.)

I could not get the fuel pump or starter to engage again. I let it rest for a while and tried again. The fuel gauge returned to normal, the fuel pump engaged, the starter turned and then everything quit again and the fuel gauge pegged. It is only pegged with the ignition switch on after I have tried to start the motor. Everything is normal until I turn the key to start, then everything shuts down without the starter engaging and the fuel gauge pegs.

If I let it sit a while, I can once again get the fuel pump to engage until I turn the key to start--then nothing. It’s almost like there is some kind of circuit breaker that trips when I turn the key to start and then resets itself after some period of time. Anybody got any ideas because I’m all out?

jimh posted 04-05-2015 09:54 AM ET (US)     Profile for jimh  Send Email to jimh     
Here is my idea:

You have a bad connection in the battery negative circuit. It has enough capacity to carry the small currents flowing before you hit START. Once that happens, the very large starter inrush current tries to flow. The current is so much that the bad connection fails completely. If everything rests for a while, the connection restores itself.

Here is my suggested remedy:

Check all the connections in the engine starting circuit. I have already written out a very detailed list of places to check., There are about 50 places. Follow the procedure I give and perform a check on all those connections. See

ELECTRIC STARTING CIRCUITS
http://continuouswave.com/whaler/reference/electricStart.html

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