1994 Overheats with AC on

[efjayatee]

Most install are :
Black to ground and Red to 12v (ignition) or cig lighter in your fuse box.

https://kosonorthamerica.com/wp-content/uploads/2020/07/BA003245.pdf

Or if you dont want to deal with 12v and ground use Trail Tech. Just plug and play. (Post# 34)