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Old 01-09-2020, 01:47 AM   #1
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Join Date: Jan 2008
Location: South Hill Puyallup, WA
Posts: 78
86 k20 quad headlight wiring question

Hi guys- converted my 78 k20 frontend to and 86 front end with quad headlights. Uppers are three-prong sylvania’s # 4656. The wiring harness on my truck was cut off a few inches out of the firewall, so i ordered new dorman plugs for the headlights. They showed up today with all three wires being black. Does anybody know which prong is high beam, which is low beam, and which is ground on these 3 prong high/low headlights so i can run the appropriate wires to the correct prong on the back of the headlight? Thanks!
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Old 01-12-2020, 05:33 PM   #2
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Location: Ottawa, Ontario, Canada
Posts: 377
Re: 86 k20 quad headlight wiring question

84-87 4 headlight wiring will work for you on this site.
1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed
Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.
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