Thanks all for the help. I don´t remember if I had this problem from the beginning, but when I have my lights on and I put the transmission lever to D1, the starter motor is momentarily activated. On a running engine that gives a nice clunk and can´t be good for the teeth on the flywheel.
If I adjust the switch a bit, I won´t have backup lights. I will see if I can fasten the contact. If that fails, I will buy another switch.
1958 T-Bird "Trovão Rosa" - "Rose Thunder"
Thunderbird registry #61670