Before doing the big 3 on that bronco, swap that alt with one from a mid 90s Taurus IIRC. Known as the "3g swap". Just have to splice in the 3g alts harness and a plug and make a notch in the broncos alt bracket. Pretty easy to do and it makes a good difference when I did it on mine.
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My PPI P1000.1 goes into protect mode when its starts clipping (according to my nano oscope).
It did that ever since i bought it new from sonicelectronix.
Is this a common thing with these amps?