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IH 384 Glow Plug Wiring Diagram

A

Anonymous-0

Well-known Member
Does anyone know where I can find an online wiring diagram for the glow plugs for an IH 384?
My cousin bought the tractor knowing that the glow plugs weren't working or at least the glow plug light won't light and he has to use starter fluid to start the tractor.
 
JimB2,
Thanks for the reply. I got a look at the 383 tractor this morning. The 4 glow plugs are wired in series with heavy single strand uninsulated wires. A black wire from the ignition switch goes to the rear glow plug and has 12 volts on it when it is disconnected from the rear glow plug when the ignition switch is in a position which I assume is the glow plug on position. The front glow plug is grounded to complete the series circuit. I need to get back to the tractor and see what the voltages are at each glow plug. The glow plugs have a .9 volts stamped on them.
Lynn
 
Hi Lynn, yes, the glow plugs are wired in series so if one is burnt out none will work. If I recall correctly on 384 you pushed the starter switch in to activate the glow plugs. The wire from the switch should go to the glow plug indicator on the dash then the other side of the indicator will go to #4 glow plug at rear of engine. The glow plug indicator is also in series with the glow plugs. So 12V/5 approximately 2V across each glow plug but due to wiring loss I believe about 1.6V is the reading you will see on a VOM. Some hints: Don't put 12V across a glow plug, most likely an open glow plug, a shorted glow plug will blow out all the glow plug connected before it. Measure each one with an Ohm meter including the indicator on the dash. IIRC the glow plugs should read less than 1 Ohm.

Good Luck
JimB
 
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