Calling all car people ...

I was thinking that if he'd added a sound system that maybe it was drawing off enough for the need of a capacitor. I've seen several cars that needed one. I put a system in my son's GMC Jimmy and added a cap to it to keep the electrical from blinking. He had 2 15 inch subs in a custom box with a 1600 watt amp. The amp needed to be bigger cause it keep overheating trying to power the subs. It probably needed to be about 2400 watts. Oh...I put a 1.5 Farad cap on it to compensate for the electrical draw.

Thanks for the ideas guys. I have taken out both things I installed. Well, not taken them out but unplugged them. Both were hardwired to the 12 V supply that goes to the cigarette lighter. Still got the same flickering. It's been one of those things that started slowly and has gotten worse. So it's some sort of progressive issue. I honestly hope it's the alternator/voltage regulator. I'll take it back to the dealership when I can and see what I can get them to do because it should still be under warranty.

i would check your grounds, battery..also is their any way you can full field your alternator i know its random but it may tell you if your alternator is bad but, if the voltage is flickering it most likely is the regulator

also see if you can get a rebuilt unit..cheaper and often comes with a lifetime warranty..that's what i put on my Audi..hasn't died in 50k miles