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I recently rewired my sound system and the same thing happened. The reason is because you have a negative and positive touching each other. When you turn the key on it turns on that accessory with the short (ie radio, cigarette lighter) that excludes interior lights head lamps or anything that works with out the key turned. If I were you I would get under the dash and look at all the wires, sounds like someone was installing something and got careless. Also it could be as simple as a positive wire touching the metal frame if your car..

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Q: 1991 Toyota pickup keeps blowing a m 1 fuse when you turn the key on Why would it do that and how do you fix it?
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