How to have my cigarette lighter switched off, when the car is off?
Hello Scotty! I want to do something simple, but the Youtube is full of nonsense. Help!
I have a 2011 Ford Fusion and I've bought a dash/ backup camera.
My cigarette lighter is always ON.
I want to have it switched OFF when my car is OFF and switched ON when my car is ON.
I would like to tap the fuses, cigarette lighter with power window.
May you show us how to do it? There are so many nonsensical videos
Well you're going to have to rewire it to accomplish what you want.
One approach would be to wire the hot lead of the cigarette lighter to a circuit that is powered on only when the ignition is on. A problem is this has the potential of overloading the circuit you connect to.
Another method is similar to what @Doc proposes, but automated using a relay. Connect the relay so it switches on the cigarette lighter only when the ignition is on. (Triggering a relay would take little current.) A solid-state relay would be preferable to a mechanical one to minimize impact on the car's electrical system, though they are more expensive.
This is the kind of thing I would do on the old clunkers that I drive. However, messing with the electrical system on modern cars is an endeavor fraught with peril so tread lightly or you could well wind up bricking the car.
Probably the easiest way is to disconnect the neg battery terminal, find the hot wire to the lighter, cut it and put a manual switch in line. This way, you wouldn't have to mess with fuses or the wiring to the windows.
I hate those fuse taps. But if you have your mind made up on doing it that way at least put a 7.5A fuse in it to power your cigarette lighter.
That's way more than your dash cam needs and if somebody plugs anything else into the lighter it may blow the fuse instead of melting the wiring behind your fuse box. (That's why I hate those things. They can create a very expensive mess)
@chucktobias is right. This kind of stuff used to be fine in the old days. If you want to do it now, at least use a micro relay (micro relay with socket around $10 on Amazon) and just use the fuse tap to energize the coil inside of the micro relay (when Key On). Let the original lighter fuse handle the load side of the circuit instead of that fuse tap.