I have an XM radio in my car that connects to the cigarette lighter. The problem is that when I turn off the car, the radio stays on and I forget to turn it off now and again. I hate it because it drains my battery. How can I get the cigarette lighter's power to shut off when I turn off my car?
You will need to change the wiring in your car. You will need a voltage tester to do this. You will disconnect the lighter from the Battery side of your fuse box and reconnect it to an equal or larger rated source on the switched side of the fuse box. If connected to a lesser rated circuit it will blow the fuse if ever used as a lighter because heating the lighter elment requires approx 30 amps. If you are not confident of your ability to work without mistakes on auto wiring I recommend you have a repair shop speciaising in auto electrics do the work. You could blow your car's computer if you mess up.
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