Ding-Ding! My thoughts exact as I was reading this. First order of business in my book, ensure the correct amp fuse is in place. If the factory calls for a 15amp and a 10amp is installed, this could be part of why the fuse is popping (10amp is under rated for the circuit). BUT, if the factory calls for 15amp and you have a 15amp do NOT increase the amp fuse. It may seem safe at first, but z34phoenix has a very big point (same point applies to your home electrical wiring.
If you draw more amps then the wiring is meant for, the wiring will get hot, next step is melting the seething following by needing the fire department.

This is an excellent suggestion. I know sometimes I've tapped into power sources for things in cars, but they never caused the circuit to exceed it's amp draw.

If you have the correct amp fuse, you either have:
- Bad ground
- Short somewhere
- Something drawing too many amps (could be the radio pulling more amps for bass hits, even a none-thumping stereo needs juice for bass)
- Failing component drawing too many amps (such as the horn itself may be malfunctioning)

 

well im just assuming at this point that the radio and horn are on the same fuse because when the horn doesnt work the radio doesnt eaither lol. how it got that way dont ask me my grandmother had her ex boyfriend put in an after market deck in the car. i think that since i think the radio is dying its blowing the fuse. i need to rip that pos out of there.