pj_corvette

So, I just bought a '78 pace car yesterday.

Brake lights wont work, however.
The rear bulbs do light up for the turn signals.
I tried setting the hazard lights, but they don't light up

So, I thought the fuse might be fried.
I took the fuse out (lower left fuse), and it looked ok. Swapped it with another fuse, and still no luck.

Any suggestions?

hotshot79

check and clean grounds

Mikes*Corvettes

If both brake lights dont work it could be the brake light switch.

Duke94

You'll need a volt meter to start trouble shooting. Check for voltage at the stop light switch (orange wire is in). Then step on brake or manually trip the switch and see if 12V is at the white wire (output). Then check for 12V at the yellow and Green wire coming out of the connector on top the steering column (with pedal still depressed). Those 2 wires go to the stop lights. If you get 12V going into the column and nothing coming out, then I would guess that the Turn signal switch is bad.

SIXFOOTER

Brake light circuit, check the fuse for volts on both sides. The hazards and brakes use the same fuse and same bulb and ground but take different paths so the turn signal switch might cause you some issues

pj_corvette

Which is the "turn signal switch" on the diagram?
The big light blue box "Directional Signal/Hazard Warning Switch Assembly"??

SIXFOOTER

Yep, thats all inside the steering column. There is a large Harmonica connector on top of the column behind the dash

jaggeedfire

I had the same issue once on my late '77. It was the ground to the chassis.

-Nick

Easy Mike

That's where I would look next. Might just need to be reset against the brake pedal arm.

Protour63

I just had a '79 in the shop for no brake lights and no hazards. had power coming from brake light switch to turn signal switch but nothing coming out of column. Ended up being corroded brake/hazard fuse in fuse block from the car being kept in a damp garage. Had enough to light the test light, but would break contact when the load of both light bulbs was applied to it. Don't overlook the stupid things!

0Willcox Corvette

While shown for 69-73, for the most part this should simplify things. I'll have to do one of these for the later cars soon.