Larry, the switch itself should not cause the fuse to go. I rewired my 67 and as I recall, the brake light circuit is normally open and pressing the brake applies power to the circuit. So, start at the switch with a ohm meter and check it. Then with one lead of the ohm meter connected to chassis ground, check the circuit. Then the results of that reading will tell you you have eliminated or not certain parts of the circuit. you can jiggle wires and pull bulbs out and see what changes.
hope this helps. mike ________________________________ From: Larry Williams <larrydwilliams1...@att.net> To: chevelle-list@chevelles.net Sent: Thu, June 2, 2011 12:33:31 PM Subject: [Chevelle-list] Electrical Short? My 65 has an old after market wire loom. I have just noticed that the brake light circuit has a short. I have blown two 20 amp fuses for that circuit. The running and turn indicator circuits appear to be normal. I have bought a new brake light switch, but have not installed it yet. I can't see how this switch can caused the fuses to blow unless it is just a bad connection. I will check the light plugs for a ground short today. Hoping not to have to trace the wire from the fuse box. Anything I missed? Larry Everyday Is A Saturday