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Old 01-09-2004, 01:46 PM   #12
RockHQ
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Join Date: Feb 2003
Location: Finland, Europe
Posts: 509
I would begin by disconnecting the bulb connectors. Then with a test light see which wires get power. After you've figured the pattern on the connector, check the bulbs with a car battery for correspondence. After that, check for continuity between the high&low beam power wires, there should be none.

If those check out fine the problem must be your low/high beam switch isn't working (oxidized contacts or even burnt because of excessive amperage) or the wires. When you add the relay kit, make sure you remove all of the existing wiring except the park lights&turn signals. I myself would make a new wire harness, that way you get a cleaner installation since all wires can be cut to exact length and routed the way you want. It is surprisingly time consuming, even though there aren't many wires to route, but well worth the trouble.
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1979 C-10 shortfleet: Olds 350, Th400, 12 bolt
Current project: 1969 Olds 455 W-30, needing a rebuild
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