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Harry Ferguson Tractors Discussion Forum

trouble shooting light circuit- help needed

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Jeff-oh

07-19-2004 06:38:12

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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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gshadel

07-19-2004 07:52:41

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Re: trouble shooting light circuit- help needed in reply to Jeff-oh, 07-19-2004 06:38:12

I have seen bad bulbs that still had continuity several times while troubleshooting trailer lights. If the bulb is shorted internally, you will have continuity, but no light. Probably best to pull the bulbs, hook them up to a couple leads and see if they work.
If you haven't already done it, check volts across the inside of the light sockets, they corrode out and don't work. Should get 6 volts between the two tabs in the socket - providing the fixture has a good ground path back to battery. I could only get about 4-5 volts on my lights. I ended-up running extra ground wires from the main grounding bolt behind the dash, down to a bolt on the tranny, then tied in leads from that bolt, up to the regulator, and to the hood. It's not original equipment, but it fixed that problem, and seemed to give me better charging as well.
Hope this helps.

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danct

07-19-2004 07:20:49

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Re: trouble shooting light circuit- help needed in reply to Jeff-oh, 07-19-2004 06:38:12

Jeff
first i would run 2 wires with aligator clips for the battery connections,just temporary to the front lights i would break the connection between the two lights and test one at a time proving that both are good if they are they can be hooked back together ,now if everything works put an in line fuse in the circuit ,if you are hooked up Pos ground ,put the fuse in series with the Negative lead to the light circuit ,now with your VOM on OHMs test your switch on and off ,it will still probably be good now test the wire you were using i think you had a solid short-circuit from your description i had a problem like this and i ran new wire and also ran a new ground as the body wasent grounded after all the years sorry this is so long ,its an easy curcuit once you have it done ,just have a lot of spare fuses on hand
good luck Danny

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