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Add up the amperage draw of all the things connected to the accessory fuse and you will probably find that it is more than the capacity of the fuse itself.
Most times external amps are directly wired to the battery with a separate inline fuse for protection, the amp is turned on by a signal from the receiver via the din cord.
My wife and daughter do it all the time at home, 2- 12 amp blow driers on a 20 amp circuit is way too much, the amp draw of all the accessories shuld be 20% below the fused amp protection. That does not mean put in a larger fuse either, the wires that carry the current are also designed to only carry that amount.
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