| Required Tools | ||
|---|---|---|
| Part Number | Description | Quantity |
| 6V-7070 | Digital Multimeter | 1 |
| 8T-0500 | Test Light | 1 |
 | |
| Illustration 1 | g00395324 |
Glow plugs and connectors (1) Terminal of the glow plug (2) Connector | |
Test the Continuity of the Glow Plug Circuit
- Connect the 8T-0500 Test Light between ground and the terminal of glow plug (1). Choose the terminal of glow plug (1) that is farthest from the battery. Turn the starting aid switch to the ON position.
The test light should turn on if the circuits are correct for the power supply.
If the test light does not turn on, inspect the circuits for the power supply for loose connections, broken wires, and other damage.
- Disconnect connectors (2) from each glow plug.
- Connect the test light to the positive terminal of the battery and to terminal (1) of a glow plug. If the light turns on, there is a continuous electrical path to the glow plugs.
If the light does not turn on, replace the glow plug.
Repeat this step for each glow plug.
Test the Operation of the Glow Plugs
- Disconnect the cable for the power supply to connectors (2). Disconnect the connectors from terminals (1) of the glow plugs.
- Connect the 6V-7070 Digital Multimeter between the cable for the power supply and the terminal of a glow plug. Turn on the starting aid switch. Observe the amperage reading of the multimeter. Then, connect the leads of the multimeter between the terminal of the glow plug and a ground. Measure the voltage.
The initial current to a glow plug should be approximately 25 amperes. The current should decrease to 7 ± 1 amperes after 30 seconds.
The voltage should be 12 ± 0.5 volts.
Perform this step for each glow plug.
- If the initial current to a glow plug is below 25 amperes and the current decreases to a value that is below 7 ± 1 amperes, replace the glow plug. If there is no reading, replace the glow plug.
If the voltage reading of the multimeter is zero, inspect the starting aid switch and the power supply for faulty components and loose connections.
- When the tests are complete, connect the connectors to the terminals of the glow plugs. Connect the cable for the power supply to the glow plugs.