Help!! Dashlights, headlights flickering constantly.

[comatoast]

Just noticed on my way to work the headlights and dash light were just randomly flickering. Also did it ( even more noticeable ) while shifting it from drive to park, actually whenever you moved the shifter at all. The battery voltage when running kinda bounces from 14-15 volts and 13-14 when at a stop.

I'm just about to install an aftermarket radio and amplifier so the last thing I want is electrical issues. Has anyone heard of this issue before?? Thanks

Car is a 2006 Grand Prix gt. s/c series 3

[steelmanwy]

I have the same symptoms (bouncing voltmeter and dimming/flickering lights) but have not added anything aftermarket. Shifting and applying brakes seem to make it the most noticeable. I haven't done any troubleshooting yet, so hopefully someone here has some knowledge.

[comatoast]

heres my first issue ( below ) and other than the obvious, starter, alt, battery, ground(s), headlight switch, Some ppl have said the PCM might be an issue.. But that is obviously a last resort

[harofreak00]

I know you said its a GP in the post, but please update your sig to match.

[steelmanwy]

My battery terminals are squeaky clean, but it ended up that the side-post bolts were loose...when I took the battery out to have it checked at the auto part store, I could see some pitting from arcing and knew what was up right away.