OMC starting problems

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  #1  
Old 07-03-07, 03:05 PM
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OMC starting problems

I have a 1989 OMC 4.3 engine. When fully charged, engine starts promptly and runs fine. Occasionally, after running the boat and then turning off the engine for , there is no response from the starter when I try to restart. Guages work fine, but engine will not turn over. If I connect jumper cables to another boat, the engine starts fine. If I remove the battery and recharge it for 5 minutes, the engine starts fine. I installed a new alternator and had the battery cables replaced. Battery is brand new. Still have the problem. Is this a sign of a bad voltage regulator, or something simpler I haven't thought of?
 
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  #2  
Old 07-04-07, 10:39 AM
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Have you ruled out the neutral safety switch?
If you are hearing no clicking sounds at all from the relays, try
working the shift handle a little with the key in the Start
position. Just move it slightly off nuetral to fwd and rev.

If you are hearing the click and the motor wont crank then
i would suspect poor cables or connections. A five minute charge
or a quick jump tells me you are disturbing a poor connection
just enough to restore the proper amp flow.

Sometimes a battery cable will be bad under the sheild.
Feel them both for hard spots which would be signs
of corroding.
 
  #3  
Old 07-04-07, 07:35 PM
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OMC starting problems

I do hear a clicking sound. The battery cables are brand new. I'm at a loss??
 
  #4  
Old 07-05-07, 10:03 AM
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OMC Starting problems

I was mistaken in my last post. The positive battery cable has not been replaced. I will change that and then see if the problem goes away. Thanks BoatMech.
 
  #5  
Old 07-16-07, 11:21 AM
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OMC Starting problems

I replaced the battery cables. Thought that solved the problem, but not so. It starts fine most of the time, but sometimes still just clicks at the solenoid. When it does that, I am able to start the motor by crossing the posts on the solenoid with a screw driver (not recommended, I realize). Do I just have a bad solenoid? Can it be replaced without also replacing the starter? (I did replace the "slave" solenoid several months ago.) It is a 4.3 litre OMC Cobra engine.
 
  #6  
Old 07-17-07, 01:11 AM
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OMC starting problems

I had very similar problems with an '88 OMC 7.5L. I was able to start the engine by jumping the starter solenoid with a screw driver. Not a pretty site when your out at sea but it told me the external solenoid needed replacement. Yours should be set up the same. It should be bolted to the top of the engine and terminated to the positive battery cable.
 

Last edited by Fitz211; 07-17-07 at 01:18 AM. Reason: I didn't read the other replies.
  #7  
Old 07-20-07, 07:36 PM
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Lets put a test light on the slave solenoid and stop with the sparks ok?
So if the slave passes current, change out the solenoid on the starter.
You are gonna have to pull it to change it out so its up to you if you
want to just do the solenoid or put in a whole reman unit.
Good diagnosis, and no fires, yeah!
 
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