Circuit/System Testing

Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Test circuit 342 for an open/high resistance.
  - if an open/high resistance is found, repair the fault on the circuit.
  - Go to next step: If an open or high resistance is not found
2. Verify the fuse is not open and there is voltage at the fuse.
- If the test lamp does not illuminate and the circuit fuse is open
1. Test circuit 342 for a short to ground.
  - If a short to ground is found, repair the fault on the circuit.
  - Go to next step: If a short to ground is not found.
2. Replace the G13 Generator.
- Go to next step: If the test lamp illuminates
Ignition Off, disconnect the X1 connector at the G13 Generator, engine running.
Test for 1 V or greater between control circuit terminal 1 and ground.
- If less than 1 V
1. Test circuit 25 for a short to ground.
  - If a short to ground is found, repair the fault on the circuit.
  - Go to next step: If a short to ground is not found
2. Test circuit 25 for an open/high resistance.
  - If an open/high resistance is found, repair the fault on the circuit.
  - Go to next step: If an open or high resistance is not found
3. Replace the K20 Engine Control Module.
- Go to next step: If 1 V or greater
Ignition OFF, disconnect the appropriate connector at the K20 Engine Control Module.
Ignition ON.
Test for less than 1 V between control circuit terminal 1 at G13 Generator connector X1 and ground.
- If greater than 1 V
  Repair the short to voltage on circuit 25.
- Go to next step: If 1 V or less
Replace the G13 Generator.