Main beam not working sometimes

[boomer]

When I start up in the morning my main beam quite happily flicks between dipped and main for the first 5 or so minutes. Then it stops working.

Could it be the relay?

It sometimes comes back but, more often than not it doesn't.

Any ideas peeps?

[Brianmoooore]

If you lose both main beams, then it will be relay or control circuit (column switch) for the relay.
Find the white wire to the column switch and short it to earth.

[boomer]

Will try that - thanks Brian