I got a new Pioneer head unit, spliced in the new harness, hooked it up and everything works great, Problem is the back of the HU that is solid aluminum, (not the lightweight case) gets hot as hell when I have the volume up. I am running a single 175W amp to a 12 and 4 interior speakers off the deck. It gets so hot you can't really touch it, and this is only after about two songs. I have never felt another stereo when its on but it seems like its way too hot. I do have all the negatives paired together for front and rear respectively and the directions in the manual said not to do this, will this fix the problem?? I have the ground to the ground from the previous stereo, and the acc and battery from the stereo wired together to the red hot wire from the sanger. the illum wire from the stereo is not hooked up, initially it was and I noticed the high HU temp, let it col down removed the illum wire and it got hot again when gettin my bumo on for about a minute. Also I was using my mp3 player through the earphone jack for one song, and a CD for another with the same results Like i said it works great and sounds like it should but I think if I left it bumpin for a ten minute period it would melt the internals and catch on fire, thus ending the life of boat and possibly crew, and we don't want that. Thanks for any help
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