Brake lights, directional lights.

[mikey531]

My directional lights stopped working. so I swapped the flashers and they still didn't work. I bought one new flasher and they started working. Now I don't have any brake lights. I have power to both sides of the brake switch when I press the switch and both directional lights work. Does the other flasher have anything to do with the brake lights? These were working until I may have moved some wires out of the way to get to the other flasher. I am lost. Thanks

[Wrenchbender Ret]

Check for power at the yellow & green wires at the turn switch when the pedal is depressed. They should both be hot. They are the wires going to rear stop lights. Only one should be hot & flashing when the respective turn switch is turned on withe key on. If they are not hot with the brake pedal depressed you most likely have a bad turn switch.

George

[mikey531]

I have American auto wire will they be the same colors? Can I check at the base of the steering column or do I have to the steering wheel off? Thanks

[Steeveedee]

There are service and repair manuals. Do you have them for your truck? If not, click on the link and download it and the wiring diagrams. You can compare them against the AAW harness. A quick check would be to see if the wire out of the stop light switch to the turn signal switch is white, like factory (or that could have been changed in the intervening decades).

https://67-72chevytrucks.com/vboard/...ghlight=hatzie

[mikey531]

I looked at the diagram and I might as well be looking at hieroglyphics. I don't understand what all the lines mean and what goes where.

Thanks for trying.

[dmjlambert]

What are you using to determine you have power to both sides of the brake switch, a test light or multimeter or something else? Just wondering what we're dealing with for tools. Can you post a picture of your column connector that shows the wire colors going into it? On the stock wiring it would have been a crescent shaped plug. Not sure what you might have for American auto wire. These are the wire colors for stock wiring, on the left is the under dash wiring harness side of the connector, the right is the turn signal switch wires that go up inside the steering column.



Colors of the under dash wiring harness side and what they are for.
black - horn button
light blue - left front turn signal light and left dash light
dark blue - right front turn signal light and right dash light
brown - power from hazard flasher
purple - power from turn signal flasher
yellow - left rear turn signal/brake light
green - right rear turn signal/brake light
white - brake light power when brake pedal pressed