My battery light recently came on and after much testing of the battery and cleaning of the terminals, came to the conclusion that it was my alternator. I replaced it with a 130 amp new alt. in which after installing it all voltage and amp readings came back perfect. The problem I am having now is that my truck is now running rough and my gas mileage dropped from 17.5-18.5 down to 12.5. My style of driving was the same. When I accelerate it hesitates a little and the ride is a little rough. I recently replaced my plugs, wires, and coil pack with motorcraft parts for another misfire as read by my code reader. The question being is the drop in mileage and rough ride due to the new alternator? There are apparently 2 kinds for this style of truck, a 130 and 95 amp. The new one I bought is the 130 amp and looked identical to the old .
Sep 7, 2010 at 8:04 PM
