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+--- Thread: 2021 CAT 259D3: Glow Plug Issue Resolution (/thread-6802.html)
2021 CAT 259D3: Glow Plug Issue Resolution - MikePhua - 07-05-2025
On the panswork forum, a user reported an issue with their 2021 CAT 259D3 skid steer where the glow plugs were not functioning properly. Glow plugs are essential for warming up the fuel and ensuring smooth engine start-up, particularly in cold weather. If the glow plugs do not receive power, it can prevent the engine from starting. The user sought advice on how to restore power to the glow plugs.
Possible Causes of the Issue
Several potential causes for the glow plugs not receiving power were identified in the forum discussion:
- Blown Fuses
The user initially checked the fuses and found that some of them were blown, which prevented power from reaching the glow plugs. A blown fuse is a common issue, and it’s always a good idea to check and replace any faulty fuses.
- Faulty Relay
The relay responsible for supplying power to the glow plugs may be malfunctioning. If the relay is faulty, it will prevent the glow plugs from receiving the necessary power. Forum users recommended testing the relay to see if it was functioning properly.
- Electrical Connection Issues
Loose or corroded electrical connections could also be the cause of the problem. Users emphasized the importance of checking the wiring connections to ensure that there are no issues, such as corrosion or loose connections, that could interrupt power flow.
- Faulty Start Switch
If the start switch is not working properly, it could also be preventing the glow plugs from receiving power. Users were advised to check the start switch to ensure it was engaging the glow plug circuit correctly.
To address the issue with the glow plugs on the CAT 259D3, forum users shared a series of troubleshooting steps:
- Check and Replace Fuses
The first step is to inspect the fuses related to the glow plug circuit. If a fuse is blown, it should be replaced with a new one of the correct rating to restore power.
- Test the Relay
After confirming that the fuses are intact, the next step is to test the relay that controls the glow plugs. If the relay is found to be faulty, replacing it should resolve the issue.
- Inspect Electrical Connections
Users recommended checking all electrical connections to ensure they are tight and free from corrosion. Any corroded terminals should be cleaned, and loose connections should be tightened.
- Check the Start Switch
If none of the above steps resolve the issue, the start switch should be inspected. If the switch is malfunctioning, replacing it might be necessary to restore proper function to the glow plug circuit.
If your 2021 CAT 259D3 is experiencing issues with the glow plugs not receiving power, the most common causes are blown fuses, a faulty relay, poor electrical connections, or a malfunctioning start switch. By systematically checking and addressing these components, users can identify and resolve the issue, ensuring the glow plugs function correctly and the engine starts reliably, even in colder weather.