59 Cummins Grid Heater Relay Replacement and Wiring
Understanding the System
The grid heater system in a 59 Cummins engine plays a crucial role in aiding cold starts. It comprises several components, with the grid heater relay and grid heater wiring harness being key elements.
Components Involved
- Grid Heater Relay
- Grid Heater Wiring Harness
- Grid Heater
Wiring Diagram
Refer to the following wiring diagram for a better understanding of the grid heater system connections:
Step-by-Step Replacement Instructions
1. Disconnect Battery
For safety, disconnect the negative terminal of the battery before proceeding with any electrical work.
2. Locate Grid Heater Relay
The grid heater relay is typically located in the engine compartment near the firewall. Identify it by the label "Grid Heater Relay".
3. Remove and Replace Relay
Using a socket wrench, remove the bolts holding the relay in place. Replace the old relay with a new one.
4. Inspect and Repair Wiring Harness
Visually inspect the grid heater wiring harness for any damage or loose connections. If any issues are found, repair or replace the harness as necessary.
5. Reconnect Battery and Test
Once the relay and wiring harness are replaced, reconnect the battery and start the engine. Allow the grid heater to cycle on and off to verify proper operation.
Conclusion
Replacing the grid heater relay and wiring harness on a 59 Cummins engine requires a basic understanding of automotive electrical systems and some mechanical skills. By following these instructions carefully, you can successfully complete the repair.
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