Table 2-4. Electrical Troubleshooting (Cont)
TEST OR INSPECTlON
DO NOT leave key in RUN position for more than 2 minutes. Failure to
follow this caution may result in damage to glow plugs.
Turn key to RUN position. Check for voltage between glow plug relay terminal
where orange lead connects and ground.
Glow plugs will cycle to 0 volts in approximately 20 seconds after first
operation. Time will shorten as glow plugs become hotter.
If there are 10.0-15.0 volts, ensure that engine is mechanically sound and fuel
system is operating properly,
If there are 22.0-28.0 volts, perform step 3.
If there is no voltage, perform step 4.
Disconnect each glow plug lead and check for resistance between glow plug terminal
and ground. Resistance should be 1-3 ohms. Check glow plugs for looseness or
If any glow plug does not have correct resistance or is damaged, replace, (See
paragraph 3-20) Tighten any loose glow plugs.
Tag and disconnect all glow plug leads from glow plugs. Check for voltage between
glow plug relay terminal where red lead connects and ground.
If voltage is 10.0-15.0 volts, connect glow plug leads and start engine.
If voltage is 22,0-28.0 volts, perform step 5.
If there is no voltage, trace circuit back to positive terminal board. (See wiring
diagram F-7 or F-8)