Having problems with your 1999 Ford F150 Regular Cab ?

I have a 1999 F150 4x4 automatic, battery light just started coming on, it has a new battery, 4-5 month old. I check with multimeter on positive and negative on battery and it did not increase the reading while truck is running. I believe it is the alternator but not positive. Do you think it is the alternator, are there other possible things that I should check first to make sure it is the alternator?

Posted / edited by AnonymousUser on : 10-06-2019

Answers :

The Alternator field fuse, and the harness for this to the alternator.

In the '99 MY this was moved back to the fuse block, engine compartment fuse # 11.

The other is the wiring harness for the alternator field and charge circuit plugged into the alternator.
This is the connector on the alternator, and can be prone to a broken orange wire ( from the fuse above ) or a dirty connector causing issues.

The harness might need a through check for damage,

Those are the things that I would start with, easy check. IF they check good, next step is to have the alternator bench tested
Repair Help & Product Troubleshooting for 1999 Ford F150 Regular Cab

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