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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?
 

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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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