ok so here is my problem...about a month ago my amp that powers my subs slowly faded out and was gone for about two seconds then came back. It did this maybe once a week at random times and I never worried about it... The other day it cut completely out for a couple minutes so when I got home I took out the connections, soldered new connectors on and screwed them back in so that I was positive everything was making a good connection... Now for the past few days whenever I am driving the amp shuts off and goes into protection mode and my tach freaks out. When I am sitting there idling (or turn the key to accesssory) its fine and never cuts out. But when the alt. starts spinning up as the engine comes up in the 1500+ rpm range the amp goes into protection mode (assuming from too much power...voltage spike of some sort and my tach freaks out). I put it in park tonight and got into the throttle and sure enough as soon as it got up past about 1500 (but really after 2,000) it goes into protection mode...then when the rpm's come back down it kicks right back on. I took it over to Sears b/c they do free battery tests and alternator tests if your battery was ok. They hooked it up and tested my battery and said it was fine then I mentioned that the amp is what tipped me off to the possible problem b/c it keeps protecting itself from the spikes and he went off on some stupid tangent about how I need a cap and he doesn't know how people think that you can install electronics and not get problems...blah blah blah and he wouldn't test my alternator b/c he said the battery was fine. So long story short I left b/c he was being an idiot. I would look into a cap if I was having power issues (lights dimming, etc.) when the subs are hitting but I'm not. Plus even if I turn the subs off through the head unit the amp will still kick off to protect itself once I get going. Sooooo hopefully a few of you read all of that and are still with me I was wondering is there some sort of voltage regulator in our trucks that could have gone bad? Or is there something built into the alternator that keeps it from over charging or something?