Diagnosis Procedure

The terminal "B" circuit supplies power to charge the battery and to operate the vehicle's electrical system.

1. CHECK TERMINAL "B" CONNECTION 
   1. Turn ignition switch OFF.
   2. Verify terminal "B" is clean and tight.

   Is the inspection result normal?

   YES

   GO TO 2 .

   NO

   Repair terminal "B" connection. Confirm repair by performing system test using DSS-5000P NI. Refer to the applicable Instruction Manual for proper testing procedures.

2. CHECK TERMINAL "B" CIRCUIT 

   Check voltage between generator connector and ground.

   (+)		(-)	Voltage (Approx.)
   Connector	Terminal
   F204 (with Cummins 5.0L) F241 (with VK56VD)	1	Ground	Battery voltage

   Is voltage reading as specified?

   YES

   GO TO 3 .

   NO

   Check harness for open between generator and fusible link.

3. CHECK TERMINAL "B" CONNECTION (VOLTAGE DROP TEST) 
   1. Start engine, then engine running at idle and warm.
   2. Check voltage between battery positive terminal and generator connector.

      (+)		(-)	Voltage (Approx.)
      Connector	Terminal
      F204 (with Cummins 5.0L) F241 (with VK56VD)	1	Battery positive terminal	Less than 0.2V

   Is the voltage reading as specified?

   YES

   Terminal "B" circuit is normal. Refer to Work Flow (With DSS-5000P NI) (with Cummins 5.0L) , Work Flow (With DSS-5000P NI) (with VK56VD) , Work Flow (Without DSS-5000P NI) (with Cummins 5.0L) , or Work Flow (Without DSS-5000P NI) (with VK56VD) .

   NO

   Check harness between battery and generator for high resistance.