I am attaching the info below but I suspect you have an issue with the splice coming from the stop lamp switch.
Take a look at the wiring diagram below and you will see that the high mount is fed off the same fuse as the left and right brake lights.
What I would do is go straight to the bulbs and find out if you have 12 volts there. If not, back track through the system and find out where you lost it.
However, we know the switch is getting 12 volts as the high mount is working so you are loosing it from that splice to the bulb.
Run through this and let me know what questions you have. Thanks
Images (Click to enlarge)
Sunday, September 19th, 2021 AT 10:54 AM