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Author Topic:   Voltage problem-1992 Montauk/Johnson V-4
klausds posted 08-29-2010 08:02 PM ET (US)   Profile for klausds   Send Email to klausds  
I have a Montauk powered by a 90 HP Johnson 2 stroke. Guages, including a voltmeter, are OMC originals. Everything is 1992 vintage.

The last two times on the water, I noticed the reading on my voltage meter is dropping-to what is now near 11 volts indicated. The last time out, there was barely enough "juice" to start the engine. I checked the voltage at the battery terminals with a hand held meter and the indicated voltage is actually just over 10.

The rectifier was replaced in August of 2007 and the battery was new in May of 2006.

I am not a mechanic, but have some mechanical and electrical skills. I went over all accessable electrical connections, dissambling, cleaning and reassembling everything. The engine otherwise runs fine and all electronics seem to work as intended.

Does anyone know exactly what the guage is measuring? Is it the voltage coming from the rectifier to the battery, the voltage available at the battery, or at some other point in the current path? I am trying to determine if the problem is the battery or the charging circuit.

Any ideas about what may be causing the voltage drop will be appreciated. Avoiding a trip to the shop would also be nice.

Chuck Tribolet posted 08-30-2010 01:34 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Smells like a charging circuit problem to me.

Put the battery on a battery charger and see if the voltage
goes back up. If it does, and the boat fires up fine with
the charged battery, you got a charging circuit problem.


klausds posted 08-30-2010 10:08 AM ET (US)     Profile for klausds  Send Email to klausds     
Many thanks. The battery is on the charger now. I assume the problem is the battery if it doesn't take a charge, or as you note, the circuit if it does.

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