For some weird reason my lights go out completely when they are turned onto main and I flash the lights? Any ideas! Jason
Not in the bug as all the dash electrics were earthed to the same place - so everything started playing up! It was just tightening the screw that’d worked loose.
Check main beam fuses, and that the relay is actually putting 12 volts on the fusebox tag on main beam. E.g. this comes from the Samba.com https://www.thesamba.com/vw/archives/info/wiring/bus_1972_headlights.jpg Headlamp relays often fill up with water from windscreen leaks then they die.
When you switch from one to the other is turns each off so, it could easily be both bulbs as they have 2 separate fuses, check fuses though and can you hear the relay clunk, it’s pretty loud
If you get all your mates round - then ask them to wave their hands in the air ....... 'cos we all know that many hands make light work ... sorry I'll get me coat.