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Bad grounds can cause some strange problems. ERAs typically have an engine ground strap, a ground strap on the trans and a cable from the battery to the frame.
I would clean them. You can measure resistance across them with a DVM when the problem is happening.
My theory is the headlights have a very high draw. I wonder if there is 12v at the head lights, but not enough amps to light them? That is easy to check.
I actually enjoy chasing electrical problems. It is a sickness.
John
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