C3.3 Industrial Engine Caterpillar

Continuity Check of the Glow Plugs

The following test will check the continuity of the glow plugs.

1. Disconnect the power supply from the bus bar and then remove the bus bar.

2. Set Tooling (A) in order to check continuity (resistance). Turn the audible signal on Tooling (A) to the ON position.

3. Place one probe on the connection for the glow plug and the other probe to a suitable ground. Tooling (A) should make an audible sound. Replace the glow plug if there is no continuity.

4. Check the continuity on all the glow plugs.

Checking The Operation of The Glow Plug

The following test will check the operation of the glow plugs.

1. Disconnect the power supply from the bus bar and then remove the bus bar.

2. Connect the power supply to only one glow plug.

3. Place Tooling (B) on the power supply wire.

4. Turn the switch to the ON position in order to activate the glow plug.
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   Table 2

   12 Volt System
   Amp	Time (sec)
   30	Initial
   21	4
   14	8
   10	20
   9	60

5. Repeat the procedure in order to check the reading on all of the glow plugs.

6. If there is no reading on Tooling (B) check the electrical connections. If the reading on Tooling (B) is low or if the reading is zero, replace the faulty glow plug.