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Allis Chalmers Discussion Forum

Bad sender unit?

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07-07-2008 12:36:15

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Hi folks-

Just installed a new Agco OEM temp gauge on my 1969 180 diesel. The needle was kind of shakey, then went to full hot ( off the scale ) and stayed there, even though the tractor was cold.. Could the problem be a bad sender unit at the thermostat or is it the gauge? Trouble is the old gauge hasn't worked in years.

Thanks for the reply

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07-07-2008 15:58:23

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 Re: Bad sender unit? in reply to ScottinBrooks,ga, 07-07-2008 12:36:15  
Was the sending unit wired for 12V+ or 12V-, it makes a difference. An improperly rewired tractor could also be the problem.

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07-08-2008 04:15:26

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 Re: Bad sender unit? in reply to DiyDave, 07-07-2008 15:58:23  
The sending unit was not replaced. It's the original. Only thing replaced was the gauge and I think it's correct.

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07-08-2008 19:11:36

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 Re: Bad sender unit? in reply to ScottinBrooks,ga, 07-08-2008 04:15:26  
With some tractors, you ground the wire to the sender, it should peg the needle- that means the sender is bad. No reaction, replace the gauge.

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