Could someone double check this wiring schematic? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 12-28-2015, 01:17 PM   #1 (permalink)
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Could someone double check this wiring schematic?

I am adding a backup camera to my truck as I can't see jack all behind me and don't want to run over one of my kids.

I don't want the camera dependent on the backup light and would rather wire it to a switch that when activated turns on the monitor and camera.

I don't see any reason why this could t work bit I have melted stuff in the past.



The carling switch I will be running it off is switched, fused and grounded already.

Other question I have is the rca cable provided with the camera comes with a 20 gauge red wire that tests full continuity end to end. I can't differentiate from the rca to the wire so unsure if it is separately run or just piggybacked on the rca. Running power through this cable could reduce cable runs but not sure if it would be compatible with video or just ruin the video signal.



Sorry this isn't super tech, just trying to back stop my plan

Cheers
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Old 12-28-2015, 01:33 PM   #2 (permalink)
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The wiring looks fine other than I would add a fuse from 12v to switch. Make sure the switch has a high enough amp rating to handle the circuit and call it good.

The rca thing. I have no idea.
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Old 12-28-2015, 01:47 PM   #3 (permalink)
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the wiring is fine. the warm up/turn on time of the monitor may be a pain to wait for. if it is run monitor power to ign and leave everything else alone. the power run down the RCA lead is done by several manufacturers just for the purpose of cutting down on leads run. use it as the run to the rear
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Old 12-28-2015, 02:06 PM   #4 (permalink)
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Awesome. Thanks guys. Just was t sure if the noise from the power run would mess up the vid signal.

The switch is fused and the monitor has an inline fuse too.
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Old 12-28-2015, 02:09 PM   #5 (permalink)
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very rarely have I ever seen a video noise problem with that set up but it is possible. the current draw is so low EMF radiation is almost nonexistent
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Old 12-28-2015, 04:28 PM   #6 (permalink)
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Quote:
Originally Posted by Cult Hero View Post
Awesome. Thanks guys. Just was t sure if the noise from the power run would mess up the vid signal.

The switch is fused and the monitor has an inline fuse too.
It's DC so it should not be much of an issue unless the alternator is spitting out really dirty power.
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Old 12-29-2015, 10:51 PM   #7 (permalink)
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I recommend changing the monitor power to the 12V side of the switch so it has "memory" power. Then the switch will do exactly what the monitor expects from a backup light switch: trigger the monitor to come on, and power up the camera.

Running camera power through the coax cable just gives the video signal a DC offset; it doesn't matter how "dirty" the alternator output is. As long as the alternator isn't spinning several hundred thousand RPM, it will never approach the frequency used by the camera, so the monitor will never pick up alternator noise.

And I'm not even sure it's actually on the camera circuit... Did you check continuity from the red wire to the center post of the video connector? The red wire might only be parallel to the camera wire inside the coax.
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Last edited by steve83; 12-29-2015 at 10:52 PM.
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