Originally Posted by OTRtech
In my experience ,over multiple vehicles and platforms, there should only be the fat red wire coming off the stud on the alternator. That wire goes directly to the battery.
Anything else has been added by the owner.
See that's the funny thing. No one in my parent's house has any mechanical knowledge besides me. That's why I get called to help prevent labor costs. LOL! My mom bought this truck brand new and hasn't let anyone touch it besides me. It has 134k miles and has only had the oil, air and fuel filters changed. This is the first time I've ever had to touch the alternator. I am thinking of taking the front off and doing the timing belt while I'm at it since the miles are up there. She uses it daily and drives maybe 200-250 miles a week now since she has retired. Used to drive from Tucson to Prescott every weekend and all the way out to Caldwell, KS once in a while. Nothing has ever been added like lights, stereo or anything of the sort. Weird truck since it's a twin spark-plug motor. Anyway....
Picked-up a Haynes manual since it's the only one I could find. Nothing mentioned or pictured about a blue wire. I've tried to follow it to a source but cannot find a damn thing. Just wondering where this stupid thing could have come from.