How To Fix Alternator. The proper voltage output is from 135 volts minimum to 145 volts maximum. Check the alternator gauge.
You may have to google for details depending on the make and model of your car. Follow these simple step-by-step instructions for removing and installing an automobile alternator with common tools. Your alternator is a vital piece of your cars starting system.
Start the alternator swap-out by disconnecting both battery cables from the battery.
Then loosen the locknut to the BAT cable and remove the ring terminal. Before unbolting the alternator ensure you unclip the wire harness on the rear of the alternator. A knocking noise can be caused by one of several things relating to the alternator. Depress the latch clip on the electrical connector going to the voltage regulator and wiggle it out.