My new 19mm MC has only one wire connection for the break light...which of the two wires from my wiring harness do I connect?

Thanks, Dave

on a '74, it's referred to as F6, the brake warning switch wire.

brown with a yellow stripe.

seen here.
http://www.pelicanparts.com/914/parts/Elec...lectric_74C.jpg

Both wires. You need to take the switch off your old master cylinder. Cars up to 74 have a ballast connected on the hand brake behind the dash. If you need a new one I have 2 left. I believe they are no longer available. $30 shippped Priority Mail.

I don't think you necessarily have to use the old switch. The BROWN wire is just a ground lead. The 19mm switch grounds through the M/C to the chassis.

At least thats what I see on the 73 electrical schematic.

Exactly--just plug the brn/yel wire in, and tape the brn wire out of the way.

--DD