Topic: Change Over in Wiring Harness

[MWM]

Good Evening,
I have mid march San Jose fastback and I trying to figure out my wiring harness. At what point did thry switch to the resistor on front of the heater box? I have the heater controls, but can't figure where it plugs into the under dash harness. Any photos? I do have a the diagram, but am scratching my head to figure it out.
Thank you!

[CharlesTurner]

Believe the changeover was sometime around March/April of '65.

If you have the original main wiring harness, it will have a black plug for the early style heater switch.  Otherwise, the heater switch has a standalone harness that connects to the resistor.  Heater motor for early setup has 3 wires, later has 2 wires.

[MWM]

Thank you Charles!
I do have a stand alone harness for the heater switch, a resistor on the front of the box and a two wire (brown and yellow) motor. What would be the power source? Is that at the controls or just off the motor?
Thanks!

[CharlesTurner]

Power source is the yellow wire under the dash on the main harness, plugs into the resistor block below the 3-prong connector coming from the fan switch.

[MWM]

Found it! Thank you Charles! I wondered what that yellow wire was for, makes sense now.