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#1 |
Registered User
Join Date: Apr 2016
Location: statesville
Posts: 1
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1978 k20 wiring nightmare
I have a 1978 Chevy k20. The wiring on my truck has been a nightmare. Now I have replaced the 2 relays under the dash and searched for hours. When. I turn either sides turn signals on all of my lights blink on the outside of the truck minus my headlights, including my cab lights. Any help would be greatly appreciated!
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#2 |
Registered User
Join Date: Feb 2016
Location: West Palm Beach, FL
Posts: 4
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Re: 1978 k20 wiring nightmare
Start by pulling all the turn signal bulbs and see if one of them is a single contact bulb. If so it connects across the park/tail light and will make them all blink.
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#3 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: 1978 k20 wiring nightmare
Grounds... Look at the radiator support grounds first.
Just because the black wire jacket looks good doesn't mean there's still copper inside the jacket...
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#4 | |
Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: 1978 k20 wiring nightmare
Quote:
__________________
![]() Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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