3895790 is the pn for a new one, about $120 new from several places, Summit has it in stock.


1973 Dodge FSM available online, should work to troubleshoot this. It's fairly detailed, chapter 24.

http://www.mymopar.com/index.php?pid=109

I'd suggest using a relay to provide power to the compressor to minimize future damage. Factory just ran it thru the switch, but in later years went to a relay. I'd think about one for the blower motor feed too.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.