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Bottom line, nothing is good about a seat bolt ground. If it works your lucky. If your going to step up your game and run an amp, you need to do the NECESSARY things that go with it. Thick guage power and ground wires, both amp and vehicle electrical. Ground to vehicle frame, if you  have to go thru the floor so be it, Etc etc. Its usually never as easy as just connecting the stuff to power and your good to go. 250w or less maybe but other than that, you gotta step up and do it right. Side note: if you still have voltage drop your alternator is just to small. When there is not  enough amperage to supply the amp, it will start pulling more volts, not good. Hence your voltage drop issue and eventual failure of the alternator.