Hello, I have a 1988 E-150 and my head lights go bright and dim when I turn them on at night. It seems like this happens when I accelerate. The interior lights and dash lights are also affected. I hope someone can help me fix this, thanks.
Im not 100% but Im pretty sure your year has an external voltage regulator. Which alternator do you have? Oem should be a 1g.
Also the test above is a great starting point.
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