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Old 01-10-2013, 09:45 AM   #1
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Question Using installed wiring for backup camera

I bought a LCD panel backup camera kit from Tadi Brothers for our 05 Dolphin. The kit comes with a wireless remote sending and receiving unit for the camera. However the remote sending unit and the camera need 12 volts to operate. The original camera is wired with a 6 conductor cable. The new camera does not have a built-in motor to adjust the tilt of the view and Iím OK with that because I just need to see that the tow dolly & car are still there and see when I can change lanes.
What I want to know is if anyone has used the installed cable to both supply 12 v and provide a circuit for the video from the camera?


Here are the diagrams for the cable:
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Old 01-10-2013, 09:51 AM   #2
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I think that top drawing is the one I made. I wired mine up with the existing cable and it worked fine. You can double up on the grounds for the motor connections as long as the shield is used for Video Ground. Use the Line labled for Audio Return Ground for Audio, Motor - and 12 VDC ground and the shield for the Video return. Then you can use the wire for 12 VDC Ground for the Motor +. There is only about 500 MA of current so a big wire isn't required.

It would look like this drawing.

Dick
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Old 01-13-2013, 12:45 PM   #3
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IT WORKS!!


Because my backup camera doesn't have audio or a tilt motor I re-purposed the wires in the installed cable like this:

Wire color - Purpose
yellow <=> video signal "positive"
black/shield <=> video signal "negative" to complete the circuit
red <=> +12v
white <=> 12v ground (-12v)
two unused wires

I had to get creative with soldering RCA phono plugs & sockets at both ends. I removed the 6 pin socket from the original Weldex monitor and left about 2" wires coming out of the socket.

I did this as well as adding a pair of auto power connectors at the monitor end of the cable so that I could completely unplug the monitor from the camera and the 12v power source.

At the camera end I installed a female RCA phono socket and soldered in a 12v plug so that the camera, like the monitor can be completely unplugged.

After all was said and done, it works so I'm a happy camper (as of right now anyway.

JJ
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Old 01-13-2013, 12:53 PM   #4
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Good on Ya Mate

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Old 01-13-2013, 03:30 PM   #5
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For video you only need 3 wires. 1 video (usually yellow) 1 hot 12v (usually red) and one ground (usually black/green)
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Old 01-13-2013, 11:11 PM   #6
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I agree, but as per Dick's directions I included both the shield and another wire as the ground return circuits.

JJ
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Old 01-14-2013, 08:58 AM   #7
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Quote:
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I agree, but as per Dick's directions I included both the shield and another wire as the ground return circuits.
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JJ


Putting the Video Return on the shield will help prevent noise on the video signal.
That's why it's called a shield. It shields electrically not physically. Running the length of the coach it may well run close to AC wiring, Furnace Com Lines, Florescent Ballasts, etc. So the better it's shielded the better the picture.
Dick
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Old 01-15-2013, 12:05 AM   #8
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As it turns out the cable does have a braided wire shield which was originally used as the other half of the video circuit. Several wires were left unused so I could dedicate a pair to the DC supply circuit.

The LCD monitor has 2 video input ports so I got a inexpensive backup - "bullet" cam - and installed it next to the TV which is front & center in the coach, so that when needed I can see what's going on behind me in the galley while I'm in the driver's seat & the slide is retracted. It isn't often that I need it but I like to know that everyone (DW & Cat) are secure befor I get underway.

Next task is to build a shelf and drawer to fit into the hole left by the CRT monitor. The LCD panel will attach to the front of the drawer and the wiring will fit in behind it in the drawer.

I'll post some pictures when its done.
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Old 01-15-2013, 08:26 AM   #9
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J. J.

Here are some pictures of the dawer and shelf I built to plug the hole left by my original monitor.

Dick
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Old 01-15-2013, 08:46 AM   #10
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J. J.

Here are some pictures of the dawer and shelf I built to plug the hole left by my original monitor.

Dick
That's just too clever by far.
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Old 01-15-2013, 09:51 AM   #11
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That shelf over the drawer is the perfect place for Chocolate Chip Cookies while on the road.

Dick
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Old 01-16-2013, 09:39 AM   #12
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You are my inspiration!
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Old 01-18-2013, 05:48 PM   #13
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final product

I wasn't half so clever as Dick. My goal was to replace the backup monitor and in the process I added a see-whats-going-on-behind-the-driver camera as well as a color LCD monitor and an improved backup camera. Here are some pics:
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Old 01-18-2013, 06:57 PM   #14
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That's a good fit. Looks like it belongs there. WTG

Dick
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