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- #2,901
It's on the passenger's side in the engine bay. I think it's on the firewall. I think it was moved to the fender when the heater blower was added. Did you did connect the horn becasue they wouldn't shut off? then there a good chance that's your drain. The amp draw of the horn is more then the horn button can handle so a relay is used. I don't want to search back thru a hunderd pages in your thread to find a picture. How about a new picture of the right side of the engine bay. I know the early ones had a metal cover. My 68 was plastic so not sure which your 64 has.
Ah black ( now metal after age ) square housing with a 3 wire terminals on the bottom, i bet that is it, i take a photo in a sec, gonna run to the store and get a battery shut off switch while the battery charges.
The horns never worked so i never reconnected them

So i might not be the relay, it was just the first thing that jumped out at me from the wiring diagram
