alternator not charging
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From: Chattanooga US
alternator not charging
this is an '85 f150 4.9 auto. I'm stumped. The alt is not charging the battery. When I first start the truck the alt will charge for about 1 1/2 to 2 minutes then quit charging completely. here's what I've done so far.....Checked voltage before cranking 12.28 immediately after start voltage climbs to 14.40 holds steady for a while then drops continuously until well below 11 volts. Harness was removed and checked (new plug installed just to be safe). Alt was tested at two different places (both good). I have 12v at the ign wire (green w/red stripe) in run. Grounds are good.
Heres something weird....I pulled the wifes expedition up and hooked the jumper cables to the now discharged battery. With the cables on and the expy running I still only got 12.02v on the battery in the '85 (expy showed 14.04v)
Ideas?
Heres something weird....I pulled the wifes expedition up and hooked the jumper cables to the now discharged battery. With the cables on and the expy running I still only got 12.02v on the battery in the '85 (expy showed 14.04v)
Ideas?
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