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1987 FC NA headlights wont turn on

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Old 03-20-13, 05:58 PM
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That worked! Jumpering turned on the headlight. So what do I do?
Old 03-20-13, 06:20 PM
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If you are confident that you grounded the White/Blue wire earlier in an attempt to get voltage to show up on the R/G wire then your relay is in need of replacement. If the grounding was proper then the voltage should have tranferred from the Red to the Red/Green wire internally, which is something you accomplished externally by jumpering the two wires together. You might want to try to ground the White/Blue wire again and if the lights don't turn on then search for or place an ad in the used parts section for a replacement.

The role of the headlight switch as it relates to turning on the headlights is it places a ground on the White/Blue wire that is necessary to the process of getting the lights to come on. Once the ground is sent it is received by the Headlight Relay at the White/Blue wire.

Last edited by satch; 03-20-13 at 06:30 PM.
Old 03-20-13, 06:30 PM
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So you think the pictures I posted earlier of the relay with all it's corrosion and stuff caused it to malfunction? And I will try it again just to be sure but all I need then is a new relay?
Old 03-20-13, 06:34 PM
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Whether the problem is caused by corrosion or not I cannot tell, but it is a bit irrelevant for it either works or it doesn't.

If the relay has constant voltage on both Red wires, and there is a ground on the White/Blue wire then there should be voltage on the R/G wire. If yours does not do this then it is in need of replacement.

Last edited by satch; 03-20-13 at 06:40 PM.
Old 03-20-13, 06:39 PM
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Alrighty well thank you so much for the help. I beyond appreciate it!
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