Originally Posted by Streetwise
I used an 1157 to replace the tail light bulb and also replaced the accy fuse which was also bad. Now while turned to ignition the brake light stays on (turn signals work normally). If I turn it to acct it does the wow test and the brake light works normally. When I hit either brakes it lights up and when I let off it goes out. Assuming it's some kind of wiring issue but it doesnt make sense to me that it works while in accy and not while running
I don't know why this would happen.
When the ignition switch is in the IGN position, battery power is sent to the ACCY and LIGHTS fuses. The ACCY fuse powers the brake light and the LIGHTS fuse powers the running lights (as well as the head light). When switched to the ACC position, the ignition switch should cut power to the LIGHTS fuse while maintaining power to the ACCY fuse. Try pulling the LIGHTS fuse. If this makes the brake light work as it should, you have a short from the blue wire (LIGHTS circuit) to the R/Y (red with yellow stripe) wire that powers the brake light.