I just installed all the a/c dash and evaporator core components on my 70' Chevelle. I plan on getting the a/c functional one day. I wanted to get the heater fan and vacuum components working first before doing the rest. I installed an M & H a/c wiring harness and I'm left with an orange pigtail off of the blower relay. It is one half of a fuse holder. Where does the other end go to? I have a couple of wiring diagrams that show two different locations. One shows it going to the horn relay and the other shows it going to an anti-dieseling relay under the dash. Where should it go and what color should the wire be, orange or black? Thanks

If it's the one under the hood that connects to the blower relay then the other half of the fuse holder runs around to the horn relay, battery terminal.

Yep, to the horn relay. M&H #10970. Just put one in this weekend.

Air conditioning cars DON"T use the orange wire to go to the blower fan. The wiring for the fan is on the inside over to the right side by the glove box. There is a connector with about five wires that go to the blower fan and a/c controls. Hit the search button above and check for posts with "air conditioning" wiring in the title.

Please find attached two veiws,one for the a/c lines, etc, and the other for a wiring diagram.