Many good answers and it is very difficult to trouble shoot a wiring problem over the posts. If your wires are numbered or color coded that would help. If it goes through the steering collom switch, that could be a mess. If you can find the same wire from your brake switch output side try to follow it and see where it goes. Maybe look on the back of your brake light holder and see if you have the same number, color wire there that left the switch. Mine are numbered and I just happen to remember then #272 is the left turn signal in the back. If you can find a point where the wire leaves the fuse, cockpit area that is accessable and you are getting 12V through the brake switch, then take a clip cord and put 12V on the lead that should go straight back to the brake lights. That will tell you if it is good from that point back. You need to get a point that you can break the trouble between the front and back. Wish I was close enough to come over and help you.
Ron
