Instruments on IH-784

jp2code · Sep 24, 2013

I've got an old International 784 tractor that I
purchased about a month ago.

It turns out the fuel gauge is stuck on FULL, the
hour meter is stuck on 1892.5, and the temperature
gauge is stuck on 1/3.

I purchased the IH-202 shop manual to look
into fixing these items, but the manual has no
electrical info.

I'd like to see what kind of voltages the sending
units are supposed to be putting out to start
debugging into this.

Has anyone found a good way to fix this stuff?

JimB2 · Sep 24, 2013

Hi,
Wiring diagram can be found at:
http://cngco.com/wiring_diagrams/IH%2054-74-84%20SERIES.pdf

Re fuel gauge, I believe that the fuel gaug showing full is that there is a short to ground in the wiring harness. The wiring harness goes from under the dash on top of the transmission under the sheet metal cover, under the seat to a molex connector behind the seat and then to rear lights and fuel tank. There is one ground wire that is connected to a bolt at behind the seat on deck plate.
Re hour meter, does the Tachometer work? If no then drive cable or drive gear on front of engine. If yes then have to send hour/tach for repair.
Re temp gauge, could be coolant sensor that is located in coolant manifold by the thermostat. Could also be a wiring issue.

JimB

Instruments on IH-784

jp2code

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JimB2

Well-known Member

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