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Farmall & IHC Tractors Discussion Forum
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Farmall M Lighting Trouble

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chadd

05-03-2005 08:49:54




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We have a 1940 Farmall M that one headlight refuses to work on. The working one reads -5.96V and the one that refuses to work reads -1.34V. I have tried grounding out the casing with a wire to the transmission housing, and it never even blinks. I have tried grounding it elsewhere, and it still makes no difference. It used to work before the bulb burned out, but now it doesn't. Anyone have any ideas?

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janicholson

05-03-2005 13:09:58




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 Re: Farmall M Lighting Trouble in reply to chadd, 05-03-2005 08:49:54  
The others have the thrust of it, here is one more tidbit. With the bulb in, and the lights on, use that volt meter of yours to probe the socket/connection to check for ground faults. use a light bar bare spot, ot thread edge to ground the black lead, then probe into the fixture to look for volts. touch the housing, then the socket, then the exposed brass of the bulb. If nothing shows up, the ground side is probably good. Pull the bulb and reach into the socket with the red probe. If ~6v it should work if not I would check to see if there is a rusty connection at the Plus terminal on the outside. if the volts showing at the terminal are low, and the connection at the switch is clean, I would replace the wire. Connect the new wire to the end of the old one with small shrink tubing (use 2", and heat well to bind them in the tube)then pull/push and curse the new wire into place, crimp on new connectors, and illuminate.
JimN

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n9lhm

05-03-2005 10:57:50




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 Re: Farmall M Lighting Trouble in reply to chadd, 05-03-2005 08:49:54  
Since you have a voltmeter, take it and trace back toward the light switch. When you find where your 5.96 volts becomes 1.34 volt you will have found it. :) Obviously the switch is OK since the other light works. Brian



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captaink

05-03-2005 09:07:33




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 Re: Farmall M Lighting Trouble in reply to chadd, 05-03-2005 08:49:54  
Farmer Bob is right when he says clean bright and tight. Somewhere there is a bad connection, probably on the ground side of the bulb, bulb socket, or where the socket mounts to the shell of the light. Inspect, clean, tighten, and replace as necessary.



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Farmer Bob

05-03-2005 09:02:41




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 Re: Farmall M Lighting Trouble in reply to chadd, 05-03-2005 08:49:54  
Chadd, I'm not sure if you have disassembled the guts of the light to check for shorts/opens in the wiring or not. You have lost the continuity necessary to make the light work. Clean bright and tight are the keys to these old 6V systems.



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