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Discussion Starter · #1 ·
recently i noticed that my headlights, and interior lights flash sometimes, going from bright to dim rather rapidly, I replaced my battery, and both terminals, The problem is still there, I was told that i may have a bad engine ground or maybe it is the voltage regulator. Any ideas?

3,105 Posts
The alternator output is fluctuating and the system voltage is going up and down, causing the lights to alternately brighten & dim.

It can be caused by:

- a bad alternator rectifier bridge
- bad alternator stator winding
- faulty voltage regulator
- varying electrical loading on the system (e.g. stereo with subs)

I wouldn't expect a poor ground to cause it but anything is possible.

It might be time to have the alternator checked out.
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