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There are no relays involved in the headlamp circuits on a 1989 Chevrolet Cavalier Z24.
The headlamp switch gets power on pin "C" (RED wire) from fusible link "A" which attaches to the starter solenoid. The headlamp switch sends the power from pin "D" (YELLOW wire) to the dimmer switch pin "C" and the dimmer switch sends the power either to the high beam lights pin "B" (LIGHT GREEN wire) or the low beam lights pin "D" (TAN wire) depending on which position it is in.
wow you need it too huh?i have a 1990 and needed it also..you would never guess where you can get it..and for FREE..your local library has every wiring diagram and fuse diagram you need in the reference section...
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