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Farmall & IHC Tractors Discussion Forum
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Super M wiring problems

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r-cubed

06-05-2005 19:13:52




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I'm revamping my "new" S-M because it doesn't charge and all the wiring is shot. Also, I presume it doesn't charge because it has a 12V battery and I'm pretty sure it is a 6V system. In any case I'm fixin' to put a 12V Chevy alternator on it and so am switching it to negative ground. The wiring harness is on the bench as I speak to be duplicated in modern wire. Here are my thoughts so far, reverse the leads on the coil and add a resistor in the circuit. The lights and starter don't care about the polarity so all they need to do is have 12V bulbs, etc. My question is I'm not sure it was a 6V system or even if the battery was pos ground originally. Am making a lot of assumptions here until I get a manual. Help!

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Bob M

06-06-2005 07:56:26




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 Re: Super M wiring problems in reply to r-cubed, 06-05-2005 19:13:52  
Your plan sounds fine! (Have one it like that myself many times...)

Only addition is with neg ground you'll need to swap the wires at the ammeter - otherwise it will read "backward" after the conversion.

If you're wiring it up from scratch, punch below for a diagram that may help.

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r-cubed

06-06-2005 14:47:34




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 Re: Super M wiring problems in reply to Bob M, 06-06-2005 07:56:26  
Thanks guys, especially for that wiring diagram.



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scot_c

06-05-2005 20:11:01




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 Re: Super M wiring problems in reply to r-cubed, 06-05-2005 19:13:52  
All the letter series up through the 350's/450's that i know of were 6v positive ground. I've heard the generators were adjustable for up to 16 or 18 volts. I used a resistor for an 85 dodge p/u v8 engine (3 or 4 bucks at auto zone) it's got a hole for mounting and blade-type connectors. I cut a small peice of metal with holes in it and mounted the resistor right beside the coil. I don't know if it's the generator being adjusted wrong or the voltage regulator but I put a 12v battery in my sm and it was getting 20-25 amps pushed into it at about 15.5 volts. lucky I guess. And unless your starter is ready to let go it will be fine with 12v hiting it low voltage heats a motor faster than high voltage.

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