Author Topic: 77 k15  (Read 2231 times)

Offline jptiger

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  • Posts: 45
  • Husband of Kim father of Joshua
77 k15
« on: April 03, 2017, 07:24:51 am »
Since getting back from body shop, tail lights/turn signals and brake lights don't work. Have voltage back at plug at end of harness. I have checked grnd at left rear light. Replaced relay under dash. Replaced 1157 bulbs. Any ideas? I found the wiring schematics and they are a big help. Gonna work on it more this evening.


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab