Circuit/System Testing

Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2, B X2 or 1 X2, 2 X2 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Remove the test lamp and disconnect the B+ cable at the G13 Generator.
2. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, 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. Remove the test lamp, disconnect the battery negative cable, and disconnect the G13 Generator B+ cable.
2. Test for infinite resistance between the B+ circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace G13 Generator.
- Go to next step: If the test lamp illuminates
Disconnect the X1 harness connector at the G13 Generator, engine running.
Test for 1 V or greater between the control circuit terminal 1 and ground.
- If less than 1 V
1. Ignition OFF, disconnect the harness connectors at the K20 Engine Control Module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If greater the 2 Ω, repair the open/high resistance in the circuit.
  - If less than Ω, replace the K20 Engine Control Module.
- Go to next step: If 1V or greater
Ignition OFF, disconnect the harness connectors at the K20 Engine Control Module, Ignition ON.
Test for less than 1 V between the G13 Generator control circuit terminal 1 and ground.
- If greater than 1 V
  Repair the short to voltage on the circuit.
- Go to next step: If 1 V or less
Test or replace the G13 Generator.