light switch on 2000 GMC Sonoma

the light switch went out, replaced it twice. the switch smokes for a second, works for a short time then goes bad. the only thing that wont work is the dash gauge lights. everything else still works. What is wrong???? can't figure it out ,guessing a short somewhere

by in Simi Valley, CA on October 19, 2009
1 answer
ANSWER by on October 23, 2009
It sounds like there is to much current flow on one or more light circuits controlled by the head light switch. You can try the following: using a wiring diagram and an amp meter, power up one lighting circuit at a time and note the amp draw. Look for which circuit has an excessive amp draw. That circuit may have a short to ground causing the headlight switch to smoke. Being the dash lights are not working you may want to begin your tests with that circuit.
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