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If it`s a 2005 or newer the light in the cab won`t light up they used that pin for something else. Mke sure you have a full 12 volts to the hot post on the heater this comes off the battery side of the alternator. It won`t work under 12 volts so do a load check on the batteries. If working let the heater go until the pro 600 completely fires up. 55degrees F is where they`re supposed to come on
 
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