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This one is complicated.  at least for me.

Engine running in both pictures.

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Key Off Above

The Coolant Temp and Fuel gauge will not work with the key ON but the fuel gauge works with key OFF.  Temp gauge only worked for 2 days.  have another posting on the issue

Fuel Gauge is Correct.  main tank almost empty auxiliary full

Key On Below

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Any Thoughts will be appreciated.  

 

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Edited by Rich
reorg and try to delete duplicate picture

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The gauges work when the key is turned to the on position, thus supplying 12v to the instruments. You can turn the key off (cutting power to the guages) and the diesel engine continues to run because it does not require electricity to operate. The shut off position on the throttle lever stops the flow of fuel to the injection pump and kills the engine.

Low coolant level sensor in radiator could be bad or wire unhooked/ faulty.

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2 hours ago, nepoweshiekfarmalls said:

The gauges work when the key is turned to the on position, thus supplying 12v to the instruments. You can turn the key off (cutting power to the guages) and the diesel engine continues to run because it does not require electricity to operate. The shut off position on the throttle lever stops the flow of fuel to the injection pump and kills the engine.

Low coolant level sensor in radiator could be bad or wire unhooked/ faulty.

I think you missed his question. It works with key OFF instead of normal key ON

reads correct key off but not key on. 

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With the key turned on - disconnect your temp sensor wire from the sensor and see if the gauge changes - then ground the wire to the engine and see if it changes. The needle on the gauge should be all the way one direction with the wire disconnect and all the way the other direction with the wire grounded. 

Same principle applies to tests your fuel gauge - but you have 2 fuel level senders to deal with.

Something to be aware of - those electric gauges can point any where with the power turned off, some always go back to the same spot and some are random.

So I wouldn't take the fuel gauge reading close to correct with the power off as an indication it's actually working with the switch off.

You can always double check by removing the gauge from the cluster and seeing what the needle does.

 

Hope this helps.

Doc

 

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