Pinpoint Test E: The Charging System Warning Indicator Is Off With The Ignition Switch In The Run Position And The Engine Off

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

E1 CHECK THE CHARGING SYSTEM WARNING INDICATOR
- Key in OFF position.
- Disconnect: Generator C102a.
- With the engine off, connect a fused (15A) jumper wire between the generator C102a-1, I circuit 904 (LG/RD), harness side and ground.
  
  Fig 1: Checking Charging System Warning Indicator
  Courtesy of FORD MOTOR CO.
- Key in ON position.
- Is the charging system warning indicator illuminated?
Yes

INSTALL a new generator. refer to GENERATOR - 4.0L SOHC or GENERATOR - 4.6L (2V) . TEST the system for normal operation.

No

GO to E2.
E2 CHECK CIRCUIT 904 (LG/RD) FOR AN OPEN
- Key in OFF position.
- Disconnect: PCM C175b.
- Measure the resistance between the PCM C175b-24 I circuit 904 (LG/RD) harness side and the generator C102a-1 I circuit 904 (LG/RD) harness side.
  
  Fig 2: Checking Circuit 904 (LG/RD) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

REFER to INFORMATION, GAUGES & WARNING DEVICES for the diagnosis of the instrument cluster.

No

REPAIR the circuit. TEST the system for normal operation.