here the story.......... i have an 2003 f250 superduty with a v10

i was towing a trailer up and down lots of hills and the battery light on the dash came on. there was no effect on the performance right away. as i kept driving into town i was starting to worry if i would make it.

as i pulled into the carls jr parking lot, the ABS light came on, all the guages shut off and the truck died just as i pulled into a parking spot.

i figured it was the alternator, had it tested at autozone (failed twice) so i swapped it out for a lifetime warrenty autozone one (very small town, nothing other than an autozone)

the truck started after being jumped but the battery light was still on. i figured that the bad alternator killed the battery. the battery was 4 years old and they usually only last 3 years in the AZ heat so i bought a new duralast gold.

the battery light was STILL on after that. the autozone guy ran his test---
engine off- battery tested fine
starting---he said something was wrong with the starter (but it cranked awesome!)
running--alternator tested fine


i just can figure out why when i drive down the road i dash light will turn on and off at random times. the truck seems to run fine. i've even been under the hood shaking the wire while i had someone watching the dash and i cant seem to make the light go on or off


any ideas????? im sure someone else has had the problem before.
thanks in advance for all you help!

 

also i tested the battery and alternator myself yesterday

with it running i was getting 14.15-14.20 volts. same out put whether i was on the gas or idling. he battery light was off at the beginning and them came on after about a minute. the voltage reading didnt change at all.