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Old 04-26-2020, 02:47 PM   #1
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Default Backup Camera Wiring Question

I've got a new JVC head unit that I'm going to install in my 2004 Pleasure Way Excel TS. Since I'll have the opportunity, I'm going to install a backup camera.

However, my intention is to use this not only as a backup camera, but also to view behind the vehicle anytime I want - for lane changes, etc.

I've got a wired unit on order from Amazon - at this time I want to go wired, not wireless. I'm going to mount the camera high on the back of the RV, between the third brake light & the upper clearance lights. I'll drill a hole into the rear cabinet, and from there I'll route it through cabinets to the front, down the A pillar, then under the dash to the head unit. Of course, I'll be sealing the hole in the back.

The unit I ordered comes with 26' feet of RCA cable for the camera feed, and 6' of power cord. I want to run the power to the front of the RV so I can plug it into a switch that I can turn on whenever I want to power up the camera.

So here's my question.

The power cable is thin, probably 20 or 22 gauge, and I know that extending it with additional cable of similar gauge for that distance is not a good idea due to resistance and potential for fire.
If I cut that cable down to a couple of inches, then splice in some 16 gauge wire to run that to the front, would that be safe?

Your advice and input is appreciated.

Thanks!
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Old 04-26-2020, 03:09 PM   #2
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Quote:
Originally Posted by graywolfkayak View Post
The power cable is thin, probably 20 or 22 gauge, and I know that extending it with additional cable of similar gauge for that distance is not a good idea due to resistance and potential for fire.
If I cut that cable down to a couple of inches, then splice in some 16 gauge wire to run that to the front, would that be safe?
!
Let's say that the camera draws .25A @12VDC, and that you are using 30' of 22 gauge wire to power it. According to this calculator:

https://www.calculator.net/voltage-d...=.25&x=78&y=18

you would see a voltage drop of 2.02% or .24VDC.

It will be fine. Don't worry about splicing in larger wire.

Don't guess, calculate.
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Old 04-26-2020, 04:23 PM   #3
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Quote:
Originally Posted by avanti View Post
Let's say that the camera draws .25A @12VDC, and that you are using 30' of 22 gauge wire to power it. According to this calculator:

https://www.calculator.net/voltage-d...=.25&x=78&y=18

you would see a voltage drop of 2.02% or .24VDC.

It will be fine. Don't worry about splicing in larger wire.

Don't guess, calculate.
Thanks for the reply, it's very helpful.
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Old 05-03-2020, 06:24 PM   #4
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I used my tag light to power the camera. I use the running lights in on position when driving during the day.
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Old 05-03-2020, 06:33 PM   #5
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I removed the cigarette lighter and replaced it with a dual USB port that has an on/off switch. I'm going to wire the power cord from the camera into the back of this port so I can turn it on whenever I want.
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Old 05-03-2020, 06:44 PM   #6
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I used my tag light to power the camera. I use the running lights in on position when driving during the day.

this is a great method- although I used the running lights on pass side ---and in the end I rewired to the back up lights...


turns out I don't care whats back there ( might change back if I had a trailer or carrier) when I'm driving


I mounted mine in the center of the 3rd brake light lens- the brake light is still good for visibility- the power wiring runs with the brake light wires


I wanted the high angle for backing the spare tire carrier up against a wall at home- without hitting it


I didn't want to have extra holes through the fiber glass.


for that reason I used a wireless feed for the video- it works perfectly fine last 4 years:


Peak PKC0BU4 4.3-Inch Wireless Back-Up Camera


( I had mocked up a couple of different camera systems incl wired and this had a better image than the others I tried...one was costco)



the monitor I have on a suction mount and when not needed I just unplug and put under the seat



mike


hmm this went to the cloud the right way around:



https://www.classbforum.com/forums/a...1&d=1588533206
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