Compression Ignition Addict
Join Date: May 2009
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mine did that right before my alternator went out. I ran for a few days with the light on before I started losing aux power to ABS, PS, stereo, wipers, windows, headlights, SRS, dash lights, and so on. It was actually kind of funny till i realized my windows didn't work. I could turn the stereo off and regain my power steering, i could turn off my headlights and get back the ABS.
lol, i barely made it home. it was summertime and my blower motor was bad so I had the window open. It started raining, it was dark out and i was about a mile from home. By the time I got home, the rain was pouring down and the windows were wide open. I was not happy.
Anyway, I digress. Your alternator has two sets of diodes, Typically, only one set goes bad, which puts more load on the other set. It still functions, but with lower output. Eventually, the other set of diodes will go bad since they were not built to handle the added load.
I would get it tested and start pricing out where to find the cheapest alternator with a lifetime warranty. I picked up mine from Auto Zone through a contact I have there. Cost me $170 for a 110amp unit with lifetime warranty.
2003 F250 FX4 7.3L CC/SB Lariat
S&B Intake, DP Tuner F5 60T/60E/80E
Wicked Wheel, Autometer Gauges
Muffler Delete, AIH Delete, foil delete
BrightBox + FogLights mod