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Farmall & IHC Tractors Discussion Forum
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4 position switch

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Pete E.O.

08-29-2003 16:56:51




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Rewiring a '40 M. Have a complete harness and wiring diagram from Robert Melville site that is great. Question- Existing wiring has a ground wire running from the field resistor. Is this to provide A positive ground or does it remove the "L" function on the switch?




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Will Sick

08-29-2003 20:01:57




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 Re: 4 position switch in reply to Pete E.O., 08-29-2003 16:56:51  
I believe that grnd wire is just to assure that the resistor is gounded. the gen fld was grounded thru the light switch box via the steering post but due to rust this failed to do the job. On maintanence charg(first position on switch) the current went thru the resistor. Then on full charge the field was fully grounded by bypassing the resistor. Make sure you clean the area where the switch box is attached to the steering post and it should charge like it is supposed to.

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Pete E.O.

08-30-2003 16:45:09




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 Re: Re: 4 position switch in reply to Will Sick, 08-29-2003 20:01:57  
Thanks Will. I wired everything today according to the book and all worked perfectly. I made sure that everything was making a good ground.
My grandfather bought this baby new in 1940 and it has been on the farm for 63 years. I "retired" it this spring. Lights probably haven't worked in 20 years. Made lots of repairs so far and still going. Great fun and much satisfaction.



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