Re: Charging question for Bob M

Posted by Bob M on January 03, 2006 at 12:02:53 from (151.190.254.108):

In Reply to: Charging question for Bob M posted by JohnG(TX) on January 03, 2006 at 11:23:46:

Hey John –

I have a Super M set up pretty much like yours (high compression pistons, LP head, etc). I quickly found that even with the complete starting system in “like new” condition it was it difficult to crank with the stock, 6 volt setup. However with a 12 volt battery it spins up and starts very nicely. So my advice here would be to go to with 12 volts.

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Regarding the existing 6 volt generator, yes you can get 12 volts out of it. However the output will be less and it will need to spin faster than normal before it begins to charge. Also the generator will tend to get hot if you run it for long periods - which will shorten it’s life.

Note also that if you install a 12 volt regulator you still risk burning out the generator due to overload unless the regulator is readjusted to match the current characteristics of the original generator.

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From my perspective a 12 volt alternator conversion is the best solution from a cost, efficiency and maintenance standpoint (that’s what’s mine has). And you can easily hide an alternator up under the hood on an M – you can only tell it’s there by getting down on your knees and peeking up under the hood.

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However if you are a stickler for originality want a generator here’s a couple options:

1 – Get the stock generator reworked to 12 volts at your starter/alternator shop. Cost is probably same as a stock 6 volt generator rebuild - about $100 - $125 or so.

2 – Replace the generator with a 12 volt one from an IHC diesel of the same era (MD, WD-6, WD-9, etc). By swapping pulleys will it look (and I believe will fit) same the original generator.

Of course either of the above requires a new voltage regulator too – figure another $40 or so for that.

Hope this helps...

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