Electronics help

[wjjeeper]

Recently picked up a 65 long bed. Experiencing 2 electrical issues and I can't seem to figure them out.

The truck has been mostly rewired but the original fuse panel and gauge wiring are in place.

1st issue - the horn isn't working. I hear a clicking when I try to sound the horn. How can I jumper to test if the horn is any good.

2nd issue - the front signals both work correctly. The rear right works, but when signalling left both rears flash. Possibly related when I push brake pedal the after market tach, oilr press, and temp gauges lights come on.

Ive been going through the wiring diagram and can't figure this out.
Posted via Mobile Device