Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I’m Chris. Welcome and thanks for asking your question!
What brand alternator did you install?
Do you own a digital volt meter so I can help you diagnose this?
When testing voltage at the battery with not electrical loads on and the truck running what voltage are you getting?
With loads like the headlights, wipers, blower on what is the voltage now?
Yes I have ran into quite a few times where as it came down to a faulty PCM or wiring issue or alternator. no particular failure seems common. You need to run some testing on the wires using the below test, starting with section B.
Also if needed here is the wire diagram.
If you get held up on any of the tests, just let me know and I will help you through it. I feel your going to find this to be the PCM since it has been checked out already and they seem to be avoiding mentioning the computer controlled charging system.
Thanks for asking your question. Your helping me pay my bills, and I
am hopefully helping you lower your repair bill or at least informing
you of the repair needed prior to getting it fixed.
You are about to see our rating system. The rating is how I am paid.
No rating and I am not paid. Neutral or Negative rating and I am not paid.
I am only paid once you rate OK or GOOD or EXCELLENT SERVICE.
Please if you need to follow up, only press REPLY TO EXPERT.
You can also reply after rating if needed. I also ask that you do reply
and state which service you wanted to select because there has been
a problem with the rating system.