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To start off I have checked the pyrometer with a mulitmeter and it shows the right reading to the corresponding temperature. Also has a good ground. Double checked all wiring to make sure all connections good.
On my third replacement CDT2. The first two only worked on the time setting. The third one works on time, and then when you flip it to temperature it works once. To get it to work again I have to cycle it though the time for the temperature setting to work and then it still only works one time before I have to cycle though the time again.
I have talked to several guys at BD but haven't got anywhere.
Any Ideas on why this is not working?

1999 Dodge Ram 3500, 134K, Airdog 150, Isspro: Boost, Pryo, Fuel, stock injectors (soon to be 100 HP),
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