1979 chevy pickup ignition/wiring trouble | Chevy Truck Dec 21, 20111979 chevy k20 4x4. 4spd. 402 bb out of a 1972 c20. other than a lobe worn off the cam this truck ran great (no electrical trouble) . i pulled the motor out, completely rebuilt everything. dropped it back in the truck earlier this week. we cranked it for about 10 seconds to prime the oil pump, then plugged the ignition in. 1979 chevy truck wiring diagram | eBay Save 1979 chevy truck wiring diagram to get e-mail alerts and updates on your eBay Feed. + Items in search results. Find the right parts for your Chevrolet. Enter Year. 1979 CHEVROLET TRUCK 1/2 3/4 1 TON 2&4WD "C" & "K" GAS & DIESEL WIRING DIAGRAM. New (Other) $12. or Best Offer.