I have come across a lot of car stereo systems over the past 10 years or so. There are so many “techniques” to installing head units. Everyone has their own opinion of what is right and wrong when wiring up a system, but just because it works doesn’t make it right.
I asked Majestic Modifications what their opinion was on the subject. How do they install so many units and always get it right?
First, if applicable, always use the harnesses. The aftermarket wiring harness will usually take the guesswork out of the installation. These harnesses attach to the vehicle’s factory wiring harness and gives you a color coded installation. You just attach red to red, yellow to yellow, etc. But is that all an installer should know?
Starting with your digital multimeter, find the power sources in the harness. One source will be continuous 12 volts, the other will be the ACC (ignition) 12 volts. These two will go with the yellow and red wires from the aftermarket head unit’s harness. They are labeled accordingly. It is usually a good idea to attach the ground wire to the frame of the dash. A lot of head units come with a...
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