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2004 Ford Crown Vic 44,500 miles I'm a 72yo retired 30 vet

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2004 Ford Crown Vic 44,500...
2004 Ford Crown Vic 44,500 miles
I'm a 72yo retired 30 vet (USN Aviation Electronics Techinician)
who attended the Delco-Remy Electrical Auto Training way back in 1967.
Discrepancy: On the way home last week, Alternator dash warning light
came on and the alt-gauge was at the top (Over-Charging). I continued
home since I was about a mile from the house. One of my auto manuals
indicated that it could be the alternator so, I borrowed a rebuilt
from my buddy at O'Reilly's. No joy, still overcharging. I checked
resistance of heavy battery charging lead from top of alternator back
to battery (fusible link) when changing alternator & it was 0.1 ohms
on different 2 Fluke meters. I also tested the battery with a heavy
load tester to see if cell was opening up. it was good,
i.e. green for 40 seconds.
Indications;
1- Max alternator overcharging/high voltage out at all times.
2- Ignition switch dead in all positions.
3- No power indication in vehicle at all.
4- No power to fuse box on passenger side fender-well.
5- If I jump power from battery to RH fuse box, car cranks
& runs but, with high-alt-output for 15-20 sec test.
Sounds like a power relay, but which one??
Submitted: 1 year ago.Category: Ford
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Answered in 6 minutes by:
6/21/2016
Ford Mechanic: Ron, ASE Certified Technician replied 1 year ago
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36,315
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Verified

Hello James and thank you for your question, my name is ***** ***** I can help you with this,

The alternator charge rate on your 2004 is controlled by the duty cycle from the PCM (computer) with your back ground are you able to do some testing If I send you the steps?

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Customer reply replied 1 year ago
I assume so
Customer reply replied 1 year ago
Are you doing via this mode or via email?
Ford Mechanic: Ron, ASE Certified Technician replied 1 year ago

Im suspecting you have a problem with the PCM but to be sure you are going to need to do some testing, see the complete file in the link below. You will want to start your testing at pinpoint test C 1.

See the first link below for those steps , copy and paste the link to your browser to open and view them

https://dl.dropboxusercontent.com/u/104923897/Alternator%20Jun%2021.pdf

See the charging system diagram for reference in this link as well.

https://dl.dropboxusercontent.com/u/104923897/Alt%20wiring%20JUn%2021.pdf

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Customer reply replied 1 year ago
James Rewis is back after printing the 2 schematics, 1st hot link was only 1 page vice 3 pages of data.
Ford Mechanic: Ron, ASE Certified Technician replied 1 year ago

Try this link, it has all you need for the pinpoint test C1

https://dl.dropboxusercontent.com/u/104923897/Alternator%20Jun%2021.pdf

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Ron
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36,315
36,315 Satisfied Customers
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

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