not charging the battery

[Scott Milliken]

My 1991 bronco wont charge its battery and i replaced the alterator and terminal wires and its holding a steady 12v but still wont charge... I had the battery tested and its still good. Im really confused about this one.

 

[Bully Bob]

Hi Scott.., Thanks for your service.!

Does that yr. veh. have an external voltage regulator...? If so, that could be the prob.

You should be getting 13-14 volts (using a volt meter) across the bat. terminals if alt. & reg. are working.

Could be the terminal wiring you installed., or the alt. is a faulty one.

Where did you get it...?

 

[Rons beast]

Are you checking voltage at the battery terminals, or right at the alternator? Or both? Do you have a guage or just the "idiot light"

If just the light is it working? Have you checked the wiring at the battery terminal? Internal or external regulator?

 

[miesk5]

yo SCOTT,

Have you checked the grounds at Intake Manifold to Block, frame, etc.; and no corrosion between wire strands and Up inside the insulation?

Alternator Test; "...The battery must be fully charged (see fig. 1). Run the engine and verify that no-load voltage is 13.8 - 15.3V.

load the alternator to rated output current by turning AC, radio, head lights, flashers, rear window defroster, HVAC fan @ High, & ws wipers ON. Run the engine @ 2000 RPM. Check the current with an 80i-410 or 80i-1010 current clamp. The unit must maintain at least 12.6V @ rated output

Ford still refers to the alternator as the generator...and the kit shown below is replaced by E5AZ-14305-AA $74.50 , But, Borg-Warner also catalogs this connector as pn PT780, $24.15

Next; Loose or Weak Contact at Generator Harness Connector TSB 96-21-4 for 86-93 Bronco & F Series, etc.

When a generator fails, there are a few failure modes that may cause heat to be produced at the wiring harness-to-generator connector. This excess heat may damage the female terminals on the wiring harness, resulting in increased resistance. The increased resistance produces more heat. When the generator is replaced, the resistance produced by a damaged connector may damage the new generator and could result in a repeat repair, including installation of another generator. High resistance (caused by a damaged connector) will not go away until the damaged connector is replaced.

ACTION:

Visually inspect the harness-to-generator connector for damage (heat, corrosion, distortion and cracking) before installing a new generator. Install the Generator Wiring Harness Connector Kit (E5AZ-14305-AA) if the harness-to-generator connector is damaged.

The Generator Wiring Harness Connector Kit (E5AZ-14305-AA) contains the following:

•One (1) Red Wire Butt Connector

•Two (2) Yellow Wire Butt Connectors

•One (1) Wire Connector Assembly

•One (1) Instruction Sheet (I.S. 6849)

PART NUMBER PART NAME

E5AZ-14305-AA Generator Wiring Harness Connector Kit

pic in a 91



Source: by Tim C (TnTbronco2, Trail Truck, Street Truck, Crazed, Broke, OoG) at SuperMotors.net

 

[Rangers41]

I have a '95 and have the same problem!

 

[Rons beast]

Internal or external voltage regulator? What checks were done and using what procedures?