Check Charging System stays on

[RileyJR]

I’m having trouble with the charging system. This is the :

• 4.0 L V-6 with 181K miles.

I have replaced the:

1. battery
2. alternator
3. complete wiring harness system.

I Replaced batt & alt last week, got the charging light and had cable corrosion, so replaced with new harness.

Everything is nicely connected. Battery holds 12.5 - 12.9 volts, when running alternator puts out 14.5 (ish) volts, pending if AC is on or not. So the system is charging.
Everything works, lights, radio, ac, windows, locks, turn signals, auxiliary connection. Have checked all fuses, all are good…no burns or blown fuses.
At least, in all the fuses where the filaments are visible.

Took back to O’Reilly’s and all power units check out to what I got on the voltmeter. So battery, alternator and starter are good. (only a week old).
Put new spark plugs in as well since I had both sides exposed. Engine is quiet.

Belt is in reasonable shape, no frays, no wear spots, no sidewall damage. I’m saying this as I have seen harmonic balances as the culprit on a couple forums. But no vibrations or power loss.

Hoping someone may have some insight or experience with an issue like this. Very frustrating and now costly ($500+ In the last week).

Worried it may be the ECM/PCM. Or will be something silly light the dash lights which we’re getting notice dimmer over the past year.

Also, bought an OBD2 tester kit and pulls vehicle info, alt/batt tests the same as above. No real faults codes as of yet, but still figuring it out.

Thanks,
John R.

 

[Rick]

2007 Sport Trac Charging system light

Hello, I have a 2007 sport trac and my charging system light came on. I replaced the alternator, belt and battery. The truck does not stay running for long, difficult starting, and sometimes doesn't start. Anyone with similar problems, solutions? Thanks, Dutch

www.explorerforum.com

Someone in this thread claimed that the fuel pump was the culprit

I also found this:


"Alternator problem solved

This may help others after replacing an alternator.

As it turns out all connections, cables, and computer were in good shape. The problem was the two remanufactured alternators I installed simply would not communicate with Ford's "powertrain control module". They absolutely were charging the battery (14.5 volts and as much as 60 amps of current, just after cranking), the warning light just didn't know it. Further, the alternators were correct for my year and engine, according to the parts store. Went to the junk yard and bought a factory alternator out of a wrecked Explorer and warning light went out immediately.

Another problem was the parts store (large national) could only test the output of an alternator, they could not check the indicator circuit. Both their alternators checked OK. Also got bad advice from two dealers. One told me to drive it for a few days and it would "average" and reset, the other, for an hour labor, they could reset it. Week later still had the red light and figured a junk yard dog was a cheaper test than the labor.

Lesson I learned: when it comes to electric components, buy factory."

New alternator, but the battery light is still on.

Explorer died on my wife, battery dead. I had the alternator checked and it was defective (130K miles). Bought remanufactured alternator and installed. Battery light remained on. Checked voltage, 14.5V, with alternator turning. Checked connections, engine off: B+ 12v, A 12v, all connections to...

www.explorerforum.com

 

[Bazz270]

I've bought reman (by Motorcraft) failed alternator from rockauto.
ended with brand new aftermarket unit.dont mess with remans ever...