John Deere Headlight
Posted November 3, 2011
By admin
Continuity to ground at hot wire?
I was working on a John Deere Gator today. I unplugged the headlight switch from the two wire connector and checked continuity to ground at the inlet and outlet terminal of the connector which is bridged with the switch when connected. I used a multimeter and probed one end of harness and touched the other meter probe to a good ground and got continuity. There is no short to ground and the headlights do work so what cause a wire that should be hot to have continuity with ground?
I'm presuming you are measuring the hot wire going to the headlight itself and ground. Headlights have tungsten filaments. Tungsten has the unique property of having a very low resistance when cold, and a higher resistance when hot. Passing current through the filament heats it up significantly and changes the low resistance to high resistance, creating light.
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