A severely dead battery can pull the alternator voltage down, making a good alternator look bad. Charge or replace the battery first, then retest the alternator.
Before diving into the instructions, it is helpful to understand what this device actually does. Unlike traditional load testers that use a heavy resistor to put a physical strain on the battery, the Auto XS tester is an . It sends a small signal through the battery cells to measure conductance (the ability to conduct current). Auto xs battery and alternator tester instructions
specific alternator results if your tester shows a yellow "overcharge" light? Auto Xs Battery And Alternator Tester Instructions A severely dead battery can pull the alternator