I made up this 3 foot long "extension cord" for cube relays. The female end is just a standard cube relay socket. Five wires running to the male end, covered with shrink wrap. The male end is five 3/16" crimp-on spade quick disconnects sitting in PC-7 epoxy contained in an old cube relay cover. Works good.
Figured out my problem in just a few minutes once I had this tool. The main power feed for the A/C system should come to one of the relays, but wasn't making it there. Turns out there was a plug that wasn't shown on the schematic that was about 6" upstream of the relay, hiding behind the A/C unit under the dash. It had come loose.
