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4wheel lock light stays on when i turn on headlights only.

(1990 Chevrolet 1500 Pickup)
in Rohnert Park, CA on December 08, 2011
does this light suppose to stay on and does it mean im in 4 wheel drive mode? Ive tried turning the knob at front left wheel hub but the light remains on but only when my headlights are on. daytime without headlights there is no light. vehicle in question is a 77 Chevy stepside K10.
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Popular Answer
on December 09, 2011
How are you with a multimeter and a wiring diagram?
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