ok my girls 04 accord ex 4 cyl at night the lights dim and brighten back up in about a mili second very hard to notice. only happens when the radio is on which is weird. Also her auto window driver side door will be up and while driving it tries to go up even more which it cant . any ideas I was thinking it was a bad ground wire, Another question off this topic can a bad ground wire cause the ecu to malfunction or the cel to come on ?

 

Yes, I would inspect/clean as many of the gounds as possible.

Depending on what ground and how bad it is, yes it can cause a CEL....it could also jeep that car from running at all.

 

so i can only find 2 grounds one near the altinator and one under the air filter box how many are there and where might the others be? what is the best way to clean them