Poly - Thread Finder
Autostaretx Dick comes through again.Ah ha! Now I know! I have the timer (without the knob) and the Cargo option! Eureka!
And again I'm reminded that RTFM does work.
P.S. - I believe that this is the first time anyone on this forum has indicated that they have an OEM Aux Heater with the non adjustable timed control switch.