Reversing camera · reverse light · trigger

Reverse camera wiring diagram

A reversing camera only needs power while you are in reverse — and the reverse lights already have exactly that. The camera taps their feed; the screen gets a trigger wire and the video cable runs forward through the car.

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The connections

Camera + → the reverse light feed (+), tapped near a rear light; camera − → body ground nearby.
Reverse trigger: a thin wire from the same feed to the head unit’s “reverse” input, so the screen switches to the camera.
Video (RCA or the unit’s own connector) runs to the front, away from power cables to avoid interference.
The camera draws about 0.2–0.3 A: the reverse light fuse covers it.

Flickering picture?

Many modern cars pulse the reverse light feed to check the bulbs, or switch LED lamps with PWM. The camera then reboots or flickers. Feed it through a small relay switched by the reverse light (or a filter made for cameras), so the camera gets clean battery + while reverse is engaged.

See it in the simulator

Run the live demo: the reverse light fuse, the gearbox reverse switch, two reverse lights and the camera tapped onto their feed.
Close the reverse switch: lights and camera come on together.
Click the camera wire: about 0.25 A next to 1.8 A for each lamp.

Questions

Can I wire the camera to be on all the time?

Yes, from an ignition-switched fuse — for a camera used as a rear-view mirror or a trailer view. Then the screen needs its own way to switch to it.

Which wire is the reverse light?

Measure at the lamp connector with reverse engaged (ignition on, parking brake on, engine off): the wire that shows battery voltage only in reverse.

Wireless camera — no wiring?

It still needs power at the back from the reverse light; only the video goes by radio.

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