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.
You may be lucky and just have a loose wire and banging just right on something might get it to fall back into place, but most times electrical problems are not that simple. Vehicles built in the 60s and 70s had very few electrically controlled devices as most things were controlled through a mechanical linkage. In the 80s and early 90s many automobile manufacturers started using vacuum controlled solenoids to operate small things like switches in the engine or the vents on your ventilation system. Since then, just about everything has become electronically controlled and regulated. Most of the electronics in your vehicle will last a very long time and never be changed, but when something does go wrong it can be difficult to pinpoint the problem.
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