Electrical Gremlin
 

When driving at night with the headlights on. While waiting at a stop light. Foot on the brake and turn signal on. The tach needle bobs up and down in time with the turn signals.

Where should I start looking to find the culprit?

69 Camaro. Headlights are standard seal beams.

Bad ground?

Yep. Question now is, where?

'

Does it happen when stepping on the brake too?
If not, it may be worth trying another Flasher unit?:hmmm:
:beers:
~ Pete

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I found a broken ground wire on the right headlight on my '69 Camaro a few weeks ago. Both headlights have a ground wire that is attached to the radiator support.

the brake is also being applied when this happens.