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ContinuousWave: Small Boat Electrical
Low voltage drain
|Author||Topic: Low voltage drain|
posted 07-02-2007 04:21 AM ET (US)
Boat is a '73 Katama powered by a 1987 70h.p. 3cyl. Johnson
Isolated the sources of the potential problem by systematically removing accessories one at a time.
Purchased a new Optima Battery this past Friday. Saturday a.m. the thing is drained. Same thing on Sunday. Its now fully charged sitting on my deck.
I have narrowed it down to the ignition switch at the helm or the motors own charging system.
Looked for frayed or burnt wires at the motor and found none. The lone fuse in the charging system relay is good.
The ignition key is in the off position. Could that switch be faulty and cause a dead battery overnight?
Do I need a new power pack or rectifier?
Any help is highly appreciated.
posted 07-02-2007 06:09 AM ET (US)
I'd start by getting a factory service manual.
You really don't want to debug this by discharging the battery
If it discharges overnight you have pretty decent current
You can test the switch by simply disconnecting it and seeing
Disconnect the battery when you aren't working on the problem
posted 07-02-2007 09:33 AM ET (US)
If the motor appears to be the source of the parasitic current drain, you probably have a diode in your alternator system which has excessive leakage current.
posted 07-02-2007 06:32 PM ET (US)
Am I on track with the Rectifier and how costly is that item?
Lastly is replacing this something a backyard mechanic like myself can accomplish?
posted 07-02-2007 09:52 PM ET (US)
Disconnect the rectifier to see if it was the source of the parasitic current drain.
A rectifier for a 70-HP OMC motor is probably under $50. It is easily installed.
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