So my truck has absolutely no brake lights. I started with new bulbs and that did not fix the problem. Next it was the fuses. Replaced fuse with a new 1 but still no brake lights. Then to autozone for a new brake switch. installed the new brake switch but still no brake lights. Am I missing something? Does anyone have any ideas as to what I should try next? Thanks to everyone in advance for their help. You guys are all great.

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do you have your regular rear parking lights? Does anything at all light up on the rear?

 

When I turn my lights on I have taillights back there they are both working. Its just the brake lights. Whether the lights are on or off I still don't get brake lights.

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One of three things could be the problem:
1. check all grounds for the rear lighting
2. Do you have a trailer lighting plug, take apart and check all wiring inside, repair and
repair and replace as needed.
3. If #2 is true (trailer wiring) check the trailer wiring harness relay under the hood
(driver's front fender, near firewall)

Hope this gives you a starting point....

 

8 seconds thank you so much for your help. I'll check that stuff as soon as I get home from work

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The wiring seems to be ok from what I can see. Where exactly are the grounds for the brake lights? I've been crawling under my truck all morning trying to find them...

 

I think they are grounded around the plug behind the rear bumper that connects the wiring harness on the frame to the harness on the bed.

On a thread hijacking note, changing out the automatic brake pedal to a brake clutch pedal assembly today, I found my wiring to the brake light switch all melted down with no insulation any more...Guess I need to do some rewiring as well!

Good Luck!