SOunds like a closed short in the ignition system. The actual ignition could be at fault. The starter may be at fault. Pinched or exposed wiring touching the chassis or another live wire may be the cause. Check your manual to be sure the 20 amp fuse is the proper fuse for the ignition system. It may just be to low of an amp and may be a 25 to 60 amp fuse or more. Only use the recommended size of fuse as using too high a amperage in a fuse can cause bigger problems if the fuse does not blow in time. These fuses serve a purpose to save the electrical and electronic parts form unnecessary damage.
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: the ignition fuse blows...20 amp when I try to
take it to the dealership next time...The battery in the wheel well should be the first clue
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