The brake light switch(s) is/are on the master cylinder.  The original 67 master cylinder is (I'm pretty sure) a one year only part, but it may have been changed over to a later part.  Either way, it has two switches (one for the front brake circuit, one for the back), and either one can send power to the brake lights.  One wire goes from the front to the back, then spilts at a connector to supply both lights.  If one bulb is working, the problem is in the wiring in the back end of the car.  I "think" the wiring connectors are behind the tar board insulation in the engine compartment.

I've found that 90% of the electrical problems on old VWs are bad connections and 90% of those are bad grounds.  Just because a wire is plugged onto a terminal and the other end is fastened into the body with a screw doesn't mean there is still an electrical connection.  38 years of moisture in the air can cause enough corrosion and rust to make what appear to be electrical connnections actually turn out to be breaks in the circuit.

Check the bulb, and if it works, wire brush all possible points of contact between there and ground, including ground.

Once you have good clean points of contact, coat them with dielectric grease.  It'll seal out the moisture and help prevent future corrosion.

culprit found! Damage to wiring from a squirrel who had been using the engine bay to store acorns. I fixed it but a bet the squirrel will be missing his food.lol.

Just wandering if anyone knows what gauge wire works best for a super 12volt system??? If anyone knows please let me know. I found out that I will need to rewire my bug and don't want to pay that much money for a wiring loom. I also want to add more inlin fuses where there aren't that many now..
Any help would be appreciated. Thanks
  Aaron

Aaron,  Amen to what Zen said about wiring unless you want to move to the "Triangle" :lol:  :lol: