oil pressure gauge on IH 1500 truck

kly

Member
1976 Ih 1600 loadstar truck. Electric oil pressure gauge quit working. I checked with a mechanical gauge and has 60 pounds of pressure. I replaced the sender unit and still shows 0 on electric gauge. I have grounded the wire on the sender with no change to the gauge. Gauge has only two wires. With the key on. Power goes in and out of the gauge. Makes the light flash on my tester.

Is there any more components between the gauge and sending unit?

Broken wire? gauge quit working?
 
Follow the wire to where it goes through the fire wall and check any plugs in the circuit for corrosion. Pull the sender wire off the back of the gauge and ground it on something. Then go under the hood and hook your test light to the other end of the wire you just grounded(after disconnecting it from the sender. If you have light, the circuit to the gauge is ok.
 
I don't know if a 1976 model IH truck still used them but all the loadstars and several previous model IH trucks that
I worked on used a voltage regulator to feed the gauges.

When that regulator failed it would normally make the oil pressure gauge read zero and the temp gauge read hot.

The idea behind the regulator was to provide a constant voltage to the gauge regardless of battery or charging condition. It would regulate a pulsing voltage in the vicinity of 7 volts if I remember right. Has been like 50 years since I worked on one.

It is just a little box behind cluster with input from ign and wires out to the individual gauges. Also, calling on memory again , I believe all the gauges had to ground to cluster and cluster to panel.

We quit selling trucks some where about the time IH started using American motors engines etc in the pickup trucks so been a long time.
 

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