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Author Topic:   OMC tach problem
Robob2003 posted 09-29-2005 01:00 PM ET (US)   Profile for Robob2003   Send Email to Robob2003  
I have a 1980 Johnson V4 100 HP Javelin outboard and a classic OMC tach of about the same vintage.

The tach had been working fine but receently quit during a very short run at near WOT. It now reads okay when I start the engine but quits in a couple of minutes.

The rectifier was replaced about a year ago when the tach would not function at all and the battery wasn't charging.

The battery is charging okay now and tests at about 13.5 volts.

Any suggestions?

Thanks in advance,

Bob on Tampa Bay

Robob2003 posted 09-30-2005 12:10 PM ET (US)     Profile for Robob2003  Send Email to Robob2003     
I solved my own problem.

I tested the rectifier with an ohmmeter per instructions in my Clymer manual and it tested okay.

The mechanic? who replaced the rectifier partially stripped out one of the screws on the terminal bar. It was held in place by the snap on cover but was loose. I replaced it with a slightly larger screw.

BTW someone on one of the threads on this site had mentioned Surplus Unlimited as a good source for prices on parts. The rectifier at the OMC dealer: $44.99 and at Surplus Unlimited: $23.95. Nuff said.

Bob on Tampa Bay

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