WHAT NEXT WITH CHARGING SYSTEM??

1994 Ford Ranger

Tiny

Kent46725

May, 9, 2012 AT 11:20 AM

Still having the same problem with alternator not charging battery. Unplugged the instrument panel, thinking it was faulty because gauges are not working. Pulled one fuse at a time while using multimeter to check for short. I'm not getting any return charge voltage back to battery. Alternator has now been checked twice and tests good. Battery is new. I've traced wire that I was told by a ford tech that is the return feed from the alternator to the battery. Odd thing. It reads the same voltage as my battery, not the 13.2 to 13.8 that it should. I am running on the battery which isn't going to last much longer. Please help!

FOUND 673 RELATED QUESTIONS

17 Answers

Tiny

Wrenchtech

May, 9, 2012 AT 12:53 PM

Test the voltage at the main terminal of the alternator with the key OFF? What is the voltage?

Tiny

Kent46725

May, 9, 2012 AT 1:53 PM

Starting voltage was 12.4, after driving it for 2 days it has dropped to 11. I am getting the same voltage at the alternator main as I get at the battery.

Tiny

Wrenchtech

May, 9, 2012 AT 2:01 PM

That's not what I asked to to test.

Tiny

Kent46725

May, 9, 2012 AT 2:16 PM

Close to 12v like I already said. With key off.

Tiny

Wrenchtech

May, 9, 2012 AT 2:36 PM

Was this tested with the key OFF?

Tiny

Kent46725

May, 9, 2012 AT 2:45 PM

Yes, key off.

Tiny

Wrenchtech

May, 9, 2012 AT 2:49 PM

Test for power on the yellow/white wire all the time and the lt green/red when the key is on.

Tiny

Kent46725

May, 9, 2012 AT 2:55 PM

Ok I am at work, so will do afterwards. I think I had checked voltage on the y/w wire and have voltage there. But don't recall getting any at that point, but will test again and let you know. Thank you for responding so quickly.

Tiny

Kent46725

May, 9, 2012 AT 8:24 PM

Ok, pwr at y/ w constant. No power at g/ r wire when on. Next?

Tiny

Wrenchtech

May, 9, 2012 AT 11:55 PM

OK, that wire runs from the ignition switch (gray/yellow) through the fuse panel and then to the charge light (gray/yellow) and from there to the alternator (lt green/red) and the circuit is broken somewhere. You are going to have to locate that wire and determine where it's losing it's power. I would be very suspicous of the fuse panel although it's just a splice. It doesn't pass through a fuse.

Please login or register to post a reply.

Alternator Replacement Ford Super Duty
Alternator Replacement Chevrolet Silverado
Alternator testing done right
Serpentine Belt Replacement
Serpentine Belt Replacement Mercedes Benz