1981 chevy c10 CTSY fuse

[kgross401]

1981 chevy c10 truck on my fuse block the CTSY fuse 20A keeps popping as soon as I put fuse in so I took apart the fuse block to trace the wires what I found is the BAT is connected to the right side of CTSY and the BAT orange wire goes to horn relay but not sure my the fuse keeps popping every time I install new fuse I also changed out horn relay any suggestions thanks

[Mike81K10]

Definitely have a short and I recommend looking at the wiring diagrams on this forum and track down the short. Always look at anyplace splices have been made, places your wires go through sharp holes and around linkages, and look for any overloads on the system. Good chance it might be a short to ground someplace if the fuse blows quickly every time. The fuse blows to prevent a fire or other more serious damage. You are correct that a relay could also cause the fuse to blow.

The wiring diagram will provide a good start!