The battery in your car may only produce 12 volts of power, but it delivers a lot of amperage. The high amps produced by a car battery can provide quite an electrical shock if you get careless while wiring your car stereo to the fuse box. Therefore, before you get started, pop the hood on your vehicle and disconnect the negative battery terminal cable, the black one. This precaution will prevent you from being shocked while working with the wiring. Just to be sure, switch off the ignition and remove the key as well.
It’s not uncommon to see people wire radios to the fuse box by inserting the power wire directly into a fuse slot and then inserting a fuse on top of it. Although this may work, it is also dangerous and could damage your new radio or create a potential fire hazard. You should also avoid using a fuse with a higher amperage rating than that specified for your new radio or stereo. While the radio will still work, you defeat the purpose of the fuse by using one with a higher amp rating. A fuse amp rating indicates how much current, in amperes, the circuit can withstand before the fuse blows. If you use a fuse with too high a rating, it may not blow or fail in time to prevent damage to your radio. For instance, using a fuse rated at 25 amps with a 15-amp car radio may allow too much current to pass through the circuit and cause irreparable damage to the stereo.
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