Re: 12-volt implements on 6-volt system

Posted by Rod in Smiths Falls, ON, on December 15, 2004 at 12:08:18 from (209.71.222.52):

In Reply to: Re: 12-volt implements on 6-volt system posted by ebbsspeed on December 14, 2004 at 12:06:16:

Hang on a Delco alternator and go for it. They're cheap and easiest of all to install.

I ran my Chrysler M-47 marine engine on 6v positive ground for 12 years. About year two I decided that 6v bilge pumps were not the way to go so I cast about for a 12v supply. The solution was a small GM Delco alternator with a self-contained voltage regulator. I hung it off an oak gas tank frame in the bilge of the boat, run off a Ford 302 fan pulley bolted on under the crank fitting on the engine.

It wouldn't work until I put a ballast resistor on a switch to produce an initial drain on the alternator, but then it worked great, giving me 45 to 60 amps at startup, and steady power the rest of the time.

About ten years ago the 6 volt generator got drowned by a 6" rise in water level while she was sitting in the slings, so we converted all the way to 12v with excellent results. It took a new coil, a ballast resistor on the distributor, and new bulbs in the lights, and of course reversed polarity to the 12v negative ground.

I'm on about the third alternator now in twenty years, but the boat starts and runs much more reliably than she did with the 6v.

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