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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Lights trouble shooting Help needed.

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Jeff-oh

07-19-2004 06:35:25




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I was working on the front lights of my TE-20 over the weekend. Connected everything up and flipped the switch.... nothing.... Smoke more Smoke Lots of Smoke.... Switch is obviously fried. Removed that from the circuit.

I started to chase the connections with the VOM. I found a short in the wire near the aft end of the engine. Pulled that wire out, and removed the copper tubing conduit from the lower left part of the engine. I get continuity through the bulb lead in wire to the hood. I even get continuity to through to the hood by the hinge bracket. But I get nothing on the frame, even right at the hinge.

I then put in a temporary jumper cable from the battery ground terminal (+) to the hood and measured continuity from the light lead in wire to the terminal but when I directly hooked the hot wire to the lead in wire nothing, on either bulb.

Am I mistaken in thinking that if you have continuity through the bulbs then they are still good? How would I check the bulbs to verify they even work. I think I basically made a direct loop circuit with only the bulb in the circuit.

Your insight on trouble shooting the light circuit is appreciated.

Jeff-oh

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Jim

07-20-2004 07:40:10




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 Re: Lights trouble shooting Help needed. in reply to Jeff-oh, 07-19-2004 06:35:25  
Jeff,
You are correct to assume that the lamp should be ok if you have continuity through the filaments. I would think you should read less than 2 or 3 ohms. If you have any doubts, use your jumper cables or better yet, use a piece of ordinary house wire from your battery directly to each lamp and you can easily determine if the lamps are functional. I believe you should disconnect the lamps from your wiring harness before you perform the tests as you initially had a short circuit to ground based upon your description of the problem. If you are sure that your short is eliminated and you run current directly to the lamps from the battery, I believe you are going to discover that you did not have a good electrical path to the lamps. You can also use a battery charger to check out the lamps but make sure you select the higher current output i.e. 20 or 50 amps as 2 or 3 amps is not adequate to drive the lamps.
Good luck.

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tractor dan

07-20-2004 06:11:11




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 Re: Lights trouble shooting Help needed. in reply to Jeff-oh, 07-19-2004 06:35:25  
I second the thought that it is the ground. Sometimes there is no ground from the light housing to the hood and you have to twist it back and forth to restore the ground.



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Tommy D6-8U

07-19-2004 18:15:55




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 Re: Lights trouble shooting Help needed. in reply to Jeff-oh, 07-19-2004 06:35:25  
Jeff,

My experience has been that you have a bad ground somewhere. Put the VOM away and use a test light. You probably are getting a continuity reading but there is too much resistance to light the bulbs. Put the ground clip of the test light on the battery ground terminal (+ in your case) and see if you have power at the bulb, then at the base of the bulb, at the grounding point out of the bulb, and so on. To make a quick check turn the lights on and probe the hood; my bet is its not making a good ground and the test light will light. If it doesn't light, the problem is further downstream, maybe at the hinge. Another spot is where the light frames or shells mount to the hood. Hope this helps.

Tommy

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CityBoy

07-19-2004 20:01:21




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 Re: Re: Lights trouble shooting Help needed. in reply to Tommy D6-8U, 07-19-2004 18:15:55  
May be easier to just rewire it. Best 2-3 hours I spent on my MF35. Used different color wires for each circuit to make future tracing easier, and put the wires in a braided fabric black wire loom material that I got from Napa. Looks good and eliminated all electrical concerns.



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