Found it! So I start into the turn indicator mechanism and when I went to get more wire slack from up under the dash, I see this splice wire running from the connector block to a wire headed out through the fire wall. I removed it and everything is good. Apparently at some point Dad or Gramps had an issue and tried a work around. Danged if I know what that was but everything works good now except the horn. Everything looks factory, the horn works when I supply direct power. How do I trouble shoot the horn relay?

Thanks,
Pat


1946 PW Grain truck, 1966 C10 long stepside, 1972 C20 Custom Camper Big Block, 1975 C10 Silverado OE big block.