Electrical System Problem

I posted this at Honda Tech but no one seems to know the answer. Please help me if you can, no need to flame...


I have a 1998 Honda Civic LX with 80k, it is completely stock.

When it warms up all the electrical systems "flicker". The headlights get bright then dim, VERY dim. The fan speed of the heater blower varies in speed. The guage lights vary in intensity. I have changed the alternator and it still does it. I have also replaced the heavy guage ground wire that connects the front of the engine to the chassis. I have also replaced the battery and made sure the battery cables are good and making good contact. I took it to AutoZone and they did an engine running alternator test and found nothing.

What could be causing this???

Because of the headlight dimming I do not even feel safe driving it at night anymore

Thanks for your help.

It is strange because it is like the whole electrical system is shorting out but it does not correspond to hitting bumps or anything... It is an AutoZone alternator. Maybe I will bite the bullet and put in the $235 Honda one

Hmmm, belt slipping on alternator... Interesting, I will check that. Maybe I did not tighten the alternator down and the belt is slack...