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Ok having some charging issues. 92 bronco. battery is 12.4v while off, while running its around 12.2v. if i rev the motor it drops under 12. Should be around 14v. I unhooked the neg cable and it stayed running. bad Alternator or bad voltage regulator? need some help
 

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Yo Calico,
Loose or Weak Contact at Generator Harness Connector TSB 96-21-4 for 86-93 Bronco & F Series, etc.
ISSUE: 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
Source: by Ford

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 (check as in fig. 1). Next, load the alternator to rated output current with a carbon pile across the battery MIESK5 NOTE, just load it by turning AC, head lights, flashers, rear window defroster, & 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..." read more
Source: by assets.fluke.com


"Preliminary checks to the charging system should be made regardless of the fault condition. These checks include:
  • Check the fuses/fuse links to the generator to ensure that they are not burned or damaged. This condition, resulting in an open circuit or high resistance, can cause erratic or intermittent charging system concerns.
  • Check battery posts and cable terminals for clean and tight connections. Clean the posts and the cables to ensure good electrical contact. Inspect battery grounds from negative post to block and then to frame. Inspect battery ground cable for corrosion under insulation between strands.
  • Check for secure connections at the generator output, voltage regulatorand engine ground. Also check the connection at the power distribution point.
  • Check the generator drive belt to ensure proper tension and no slip between the generator pulley and the drive belt. Refer to Section 03-05.
  • Check battery for full charge as outlined."
 

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It's easy as our to remove. Drive to an auto parts store, pull the two mounting bolts and have them bench test it.

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