i have alternater noise

I hade a friend install all my system and it sounded good, no alternator noise. Then i wanted to add a couple of tweeters in the back doors of my 04 silverado ext. cab. i watched him install it this time. he hooked up 4 6.5s and 2 tweeters, but he hooked it up like this. he took the + from the amp and ran it too the first speaker and the - of that speaker to the + of the next speaker and so on and then the - of the last speaker to the - of the amp.It was a two channel amp but he had it in bridged mode. when turning it on it made a really high pitched sound and wouldn't stop even after the key was turned off. so it all got unhooked and put back the way it was but now i got alternator noise.What could this be?THANKS IN ADVANCE.PLEASE HELP!kickerL7

in my own installs any time ive ever had alternator noise was because of the ground, are you sure its alternator noise? alternator noise will go up and down with the engine and all but disapear when you kill the engine, i used to run an old old old amp (so old the rca's where red and yellow) and if i tryed to run to low of ohms in bridged it would do ecataly what your describing.. it was a la sound i beleave my suggestion would be to run the 6.5's in parrell and sterio off the amp, and then the tweeters off the deck. but check your ground, and possibly the rca lines if you run them with the power lines some times you will pick up noise."I can see down your shirt" *its painted on the bottom of my f-250's door*

It may not be much help but I had the same problem with some amplified 6x9's and hooked up a noise filter and it made the noise disappear