balbaron,
The brake light wire goes on the line, or power side of the switch.
This means the switch is AFTER the brake light wire and won't affect it..the switch won't turn it off!
Put a in line fuse in this circuit.
If you have a voltage tester, all this will become a cake walk.
The factory wiring diagram clearly shows a light switch with a fuse included. Yours must have been altered.
Basic wiring, even in '41, included fuses.
Stuart
