74 XLH electrical issue

[BW74XLH]

I've run into an electrical issue that's got me stumped. My headlight flickers off a breaker instant and back on. Turning signals are now dead, as is the rear light. The engine seems to be dropping off/on too causing the plugs to black out. Any ideas?? 

[wreck74]

Check all neg. grounds. Also you could run it in the dark and look for sparking wires in the headlight bucket and all of the wireing.

[BW74XLH]

Ended up being a misaligned rear brake switch, shorting against the terminals. Thanks, BW