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Headlights- electrical question 200 1986

posted by  rstarkie on  Tue Dec 23 03:03 CST 2003
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last visit: Fri Oct 24 10:14 CST 2014
[RELATED]

Back at it this morning. What I have found is as follows:

Black/yellow wire from ignition switch is always hot- 12v
Yellow wire from switch supplies 12v to headlight relay when headlight switch is ON and turns the lights off when switched to OFF.

So from what I understand the fault is in the constant 12v being supplied by the black yellow wire that is only supposed to be hot with the switch on. I verified this by unplugging the HL switch and probing the black/yellow female in the connector.

Fuses 1,2, and 3 are supplying 12v with the key ON or OFF. From what Bob and Bruce have told me and from the Bentley's wiring diagram I see that the power to those fuses is from the yellow wire on the ignition switch. If that is correct (?) then if I find that I have continuity between the males in the ignition switch for the yellow wire and the 12v supply wire (Which wire would that be???) to the ignition switch (with the switch OFF) I have found the fault. The fault being in the switch. And swapping out the switch from our recently totaled 88 240 should solve my problem? Again thanks for your input, teaching, and tutoring on this problem :-)

Randy






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