66 Valiant heat/ac fan question

Well, today with good sunlight I looked around and on the drivers side fenderwell was an extra harness tucked away, apparently when we hooked everything up we couldn't figure out where that went and just kind of put it to the side. It had the heater blower motor hookup (which was green) and a blue wire that's much longer that I believe probably goes to the A/C compressor whenever we get that installed.

Thanks for the help! The fan still won't turn on with the switch but I'm sure it's a bad connection, bad switch, or bad resistor. I'm going to check all that out with a multimeter here in a bit.