Circuit/System Testing

• If the test lamp does not turn On and the circuit fuse is OK 

1. Ignition/Vehicle - Off & Remove - Test lamp - Disconnect - Battery Positive Cable @ Generator Cable
2. Test for less than 2 ohms between the test points: B+ circuit terminal @ G13 Generator & Output terminal @ Fuse
   • If 2 ohms or greater - Repair the open/high resistance in the circuit.
   • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.

• If the test lamp does not turn On and the circuit fuse is open 

1. Remove - Test Lamp - Disconnect - Battery Negative Cable @ C1 Battery & Disconnect - Battery Positive Cable @ G13 Generator
2. Test for infinite resistance between the test points: B+ circuit @ Generator Cable & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • If infinite resistance - Replace the component: G13 Generator

• Go to next step: If the test lamp turns On 

• If less than 3 V 

1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect - Harness Connector @ K20 Engine Control Module
3. Test for infinite resistance between the test points: Control circuit terminal X1 1 @ Component harness & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.

• Go to next step: If infinite resistance

• If 2 ohms or greater - Repair the open/high resistance in the circuit.
• If less than 2 ohms - Replace the component: K20 Engine Control Module

• If greater than 5.5 V 

- Ignition On

• If greater than 1 V - Repair the short to voltage on the circuit.

• If less than 1 V - Replace the component: K20 Engine Control Module

• Go to next step: If between 3 and 5.5 V