I've got a mystery problem for everyone out there. My 04 Silverado LS 4.8 has a dimming problem. Every time I accelerate hard to pass, or have a little fun, my lights dim. All the lights! My interior dash lights, headlights, everything. I also notice some hesitation. This is the part that has me worried. I don't know if I'm going to hit the gas hard one day, and have my truck die. If I accelerate easy, I don't have the problem. I have an HO alternator, upgraded battery, and have upgraded the "big 3" wires to 2 gauge. I have also replaced the serpentine belt, belt tensioner, cleaned the remaining pulleys, to make sure there is no slippage there. I am running a single amp for subs, but I don't have to have the system on to see the problem. I also have a capacitor installed (FYI - If your lights dim with the beat of your bass, a cap will not fix it. At least it didn't in mine. The HO alternator did fix that problem) Does anyone have any other suggestions? My thoughts are that I still have another ground wire somewhere that is the culprit, but I don't know where to look. The local "Dealer" was able to see the problem and replicate the problem, but could not tell me how to fix the problem. They had it for 2 days!