High beam control lamp lights up

[johnnyb]

I have a 1000, 1972 auto and it runs great. On idle it is all good, but when I put it in drive and take off the control light for high beam starts lighting gently/flashing. This happens on low beam, and when turning to high beam, the control lamp turns off.
Any ideas on what this is anyone?

Greetings from Norway
JohnnyB

[jockduck]

Hi, I suspect it may be an earthing fault, poor earths are a great source of mysterious faults.
Jock