Fig. 4 Engine wiring diagram-1971 all L6 and V8 engines; Fig. 5 Engine wiring diagram-1972-74 250 L6 engine; Fig. 6 Engine wiring diagram-1972-74 all V8 engines; Access our Chevrolet Full-size Cars 1968-1978 Wiring Diagrams Repair Guide by creating an account or signing into your AutoZone Rewards account.. Fuse is good. It looks like this orange wire travels from the fuse block to the dome light connector where it splits then to the brake light switch. Wiring: My wiring from the junction block at the firewall to the front parking lights has checked out good. Same goes for the wiring to the rear of the truck, from the firewall back it is in good.
68 Firebird wiring diagram.. The brake lights are integral to the turn signal circuits. Here are the schematics for them.. GM turn signals (2).pdf. 339.3 KB Views: 141. GM turn signals.pdf. 401.5 KB Views: 121. Save Share Reply Quote Like. C. Coram Stiner Discussion starter. 23 posts · Joined 2013.. Chevy Forums FREE technical assistance for your restoration and repair. Model specific subject matter experts, classified ads and more.. 68 wiring diagram (Topic#171818) OLDS STYLE Contributor Posts: 137 Reg: 04-16-07. User Info. Send Private Topic. for lack of brake lights and a few other electrical issues (turn signals, and wipers.