Quote:
Originally Posted by greg_h
The cable to the right is the fresh air door of the heater. It was I believe 53 and later. Earlier fresh air heaters did not have that trap door to allow fresh air into the cab. The other hole as mentioned would have been where the throttle cable would have gone in a manual transmission truck. The hydra-matic had an automatic choke and both the throttle cable and choke cable holes would have had the plugs shown in the assembly manual picture posted. The button you show looks like it could be some sort of resistor maybe for a 12V conversion?
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I put the same heater in my 53 and used a similar control to reduce the voltage about 35 years ago. It still works.