Join Date: Jan 2011
Location: Canby, OR
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Weird Alternator problem
So I have been searching and reading several other threads on alternator issues with the 6.0L and so far I have not been able to figure out mine.
Alternator is a Motorcraft 110amp single remanufactured - only 2.5 months old
When I start up my truck, I am able to keep track of the battery voltage from the alternator using my Edge Insight CTS. It typically is at around 11.5v - 11.9v when I first start up the truck and usually after about 1 minute it jumps up to 13.5v -14.1v and this is what I would expect. The odd part is my battery light will come on and stay on for approximately 5-10 miles and then will go out, but occasionally going down the road it will turn on again and then go off in another couple of miles.
Just recently it has decided a couple of times not to start charging at all. The battery voltage stays at about 11.5v -11.9v and even after 5 min of driving and at freeway speeds its not kicking up. The first time I pulled over, unplugged the 2 wire plug and kinda jiggled the wires around and checked all connections to the batteries and then started up the truck. It returned to normal working order. So last night I went to the gas station, filled up, started up the truck and would not kick into charging mode. Drove the 5 miles back to the house and tried unplugging the alternator and and jiggling the cords. Did not fix the problem. I tried checking all the wires again and everything is secure.
Went out this evening to try the truck and everything is back to charging, but still with the annoying battery light.
The last thing I am going to check is grounding wires, but other than that, I am out of ideas. Any suggestions would be greatly appreciated.
Ordered: 2017 F350 PSD CCLB Lariat FX4 - Est Delivery End of December 2016
1974 F250 Highboy 4x4
V8 390 w/ 4 barrell Holley carb, Electronic ignition system, Dual Exhaust, Winch
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