Kaw H1B - Head Light Dims When Indicators Flashing?

[Syd]

I have just noticed that when the LH or RH indicators are flashing on my 72 Kawasaki H1B, the headlight dims in the same sequence which did not use to be the case. Before I proceed further, any ideas or tips on what could be causing this problem to happen out of the blue would be much appreciated - thanks

[mraxl]

The signals draw heavy current. If the battery is low (weak) or rpms are low where the alternator is not producing high output this will happen.... it is not abnormal.

[Syd]

Thanks - I had just charged my gel battery the day before the ride on Sunday so I'll start by checking the voltage when running and at idle