Amp light and rear ABS dash lights on

92 Fullsize Bronco has amp light on continually, seems to start and run fine, even in below zero temp. voltmeter jumps around sometimes when lights or blower motor is on, but returns to normal area on gauge. could this be a bad voltage regulator or alternator problem? Also occasionally the rear ABS light comes on then goes out, does this sound like a axle sensor or wiring problem? Any info will gretly help.

Disconnect the ABS and leave it that way.Ford had lots of problems with this ABS system.Your brakes will work better with the ABS disconnected.

ok how would i go about doing so, at the master cylinder or removing a fuse ? Not sure