Am restoring one that had a rat's nest of cobbled together aftermarket wiring. Per my assy manual, the '72's did not have that relay with the rubber cover that goes on the engine side of the firewall. Just where did the top system get it's power from? Is there a lead that goes from the horn relay to the dash switch, or does it draw it from the fuse box?

Thanks!!

 

Top power for this year comes from the fuse box, from the 40A circuit breaker (IF it is still there) in the upper left corner. No relay - switch handles all the current.

 

Thank you for the information.