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Originally Posted by rodeo02
John- if your charging system is putting out 14V with the truck running, you do not have a charging system issue (battery or alternator). If your serpentine belt was slipping, you would also loose your power streering, a/c and cooling system fan / everything that runs off that single belt.
Joel
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I checked my battery at work with a digital voltmeter. It registered 14.32. I drove home which took me 30 mins, and the voltmeter registered 13.7 while running. Is this dip the norm?
The reason I was thinking the serpentine belt was at fault is because I had the belt changed a couple of months ago. I had them order the belt, they said it would be ready in four days. Four days later I went to get the belt changed and they said they did not have it but they had one that was close. When they stretched my old belt and the new belt. The new belt was about a half inch longer. The said the tension pulley would take up the slack. It suddenly dawned on me after reading this thread that my old belt may have already been worn and stretched and comparing the sizes between old stretched belt and new would be inaccurate. Maybe there is not enough tension in the belt to prevent a random slippage.
After the belt was changed the P01870 came on, but not immediately it takes a couple of days or 100 to 200 Kms before the light comes on after the codes are cleared. I'm thinking the lack of tension is not enough to affect the cooling system or other systems, but is enough to have the alternator under produce after a 100 kms.
I am also finding the dealer inept and\or devious (I have already caught them lying twice). I find that the best way to figure this problem
out is discussing this hear before I spend to have the tranny opened up. I appreciate your knowledge and help.
John