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#1 |
Active Member
![]() Join Date: Aug 2003
Location: san diego
Posts: 833
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Headlights are out
I have a 72 gmc short bed and the headlights don't go on. Taillights, dash lights and running lights are all okay. I am not real mechanical and was wondering if someone could give me the basics of troubleshooting this problem. By the way the high beams haven't worked since I purchased the truck 18 months ago. Thanks
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#2 |
Registered User
Join Date: Jun 2004
Location: warr acres,oklahoma
Posts: 650
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check your dimmer switch.replacement is about 5 dollars at a parts store.sorry,but i don`t recommend auto zone crap.hope this helps
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#3 |
1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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I agree on the dimmer switch. To test, unplug the wiring harness from it and use a jumper wire. It should have 3 wires and one will have power. Jump that one to either of the other 2. If it's a bad switch or dirty connections, lights should work. Jump to the other terminal and again lights should work. One will be lows and the other will be highs.
Often times it's just dirty connections though.
__________________
Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 |
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#4 |
Active Member
![]() Join Date: Aug 2003
Location: san diego
Posts: 833
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Thanks guys
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#5 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,287
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Be sure to also check the ground leads from the ends of the headlight harness to the radiator wall. One each left and right. The 4-eyed set-up is a little more prone to bad grounding than the 2 headlights of a Chevy. (I have a '71 Jimmy, too) Sand or file any corrosion from the terminal ends and around the screwhole and re-attach.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#6 |
Active Member
![]() Join Date: Aug 2003
Location: san diego
Posts: 833
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great info, thanks
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#7 |
Active Member
![]() Join Date: Aug 2003
Location: san diego
Posts: 833
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You guys were right on, it was the dimmer switch. Thanks again guys. Regards, Scott
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