Component Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
PTO Relay (If supported by the PTO upfitter wiring)
- Ignition OFF, disconnect the PTO relay.
- Test for approximately 50-200 ohms of resistance between terminals H and J on the upfitter wiring side of the upfitter PTO connector.
- If the resistance is not within the specified range, replace the relay.
- Test for infinite resistance between the following terminals:
- F and J
- F and H
- F and K
- K and J
- If less than infinite resistance, replace the PTO relay.
- Install a 15-amp fused jumper wire between relay terminal J and 12 volts. Install a jumper wire between relay terminal H and ground. Test for less than 2.0 ohms of resistance between the relay switch terminals.
- If greater than 2.0 ohms, replace the PTO relay.