Heater fan ?

[ed1946]

Which wire in the bulkhead connector is the one to run heater fan. 72 dart with a/c. I have a wiring diagram but unsure which wire.

 

[ed1946]

Nobody hazards a guess. Anyway went and added a wire "B" on the harness to blower motor. I have new harness their because I switched from 3 way wiper motor to a 2 way, so bought new harness and 2 way switch and wipers at least have 1 speed. The blower motor works on a/c switches and defrost, didn't seem to work on heat. I'm thinking the blower motor is tied into a/c compressor somehow. My diagram does not show blower motor connection, the whole thing is very confusing. Any thoughts.

 

[ed1946]

What is this, relay? My car does not have this and was looking at another post and saw this and wondered if this was part of my problem.