Disconnect the horn and put a test light across it instead.
Then with a good fuse, blow the horn about 50 times.
If the fuse does not blow, and the light comes on, then you know it is the horn itself that was blowing fuses.
Could be you might check it out. many items take the same relay so you might try exchanging it with another one with the same numbers. If that isn't it you may have a short in the horn itself.
SOURCE: 20 amp fuse in the box under hood that keeps blowing
Does it only do this when the heat or A/c is on full blast.. ( I had a few of my customers with this problem and they needed a new blower motor..)
SOURCE: 20 amp ignition fuse keeps blowing
I'm curious, does this vehicle have an alarm/remote starter? If so I expect the installer didn't wire it correctly ... it was an all too frequent issue, with inexperienced installers we had .... I would first suspect any add-on device first (if any) ... In answer to your question ... I know it does have a relay (Starter solenoid is a relay and built onto the starter) As far as it being a relay or the IGN switch ... I'm skeptical.
SOURCE: my 2002 dodge stratus keeps
My 1999 dodge stratus did the same thing. Its a short in the starter solenoid its attached to the starter. all you have to do is change the starter.
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