2004 GMC Yukon XL 1500 Q&A
2004 GMC Yukon XL 1500 Question: battery indicator light is coming on¤t battery went dead.
Need to have charging system tested. You either have some sort of wiring connection problem, defective alternator, or its possible the PCM could have failed. Alternator is controlled by the PCM. - milesauto
do you have pwr at large red wire in the rear of the alt. lets start there. - globalhelper