Yellow RCA connections are usually composite video such what you’d find coming from a camera...

There should be 4 wires: composite video with signal and shield and power with positive and earth (ground).

 

Thanks. So what do you suppose the "extra" red wire is for coming from the yellow video cable connection? I'm assuming that it's the "signal" wire that tells the camera that the vehicle has been placed into reverse and to send a signal to the video display (head unit). I've taken the red/black cable and used it as the power and earth (ground) wires, and connected it to the switched auxiliary power supply found in the trunk area.


Back of the car connections. Red/black went to power/earth (ground), yellow video cable is pulled through the car to the dash area, and the red wire is now attached to the CA025 orange wire in the wire loom behind the rear seat.

Without any instructions whatsoever from the supplier on the backup camera (or video display / head unit), I'm left to make some inferences on this end.

Presuming that set of assumptions is correct, the only thing I remain unsure about at this moment is the corresponding "red wire" that accompanies the yellow video cable connection at the far end (the end that will plug into the adapter or head unit directly). My assumption (and I hate those things) is that its a secondary / alternate "signal" wire that could be enabled in the passenger compartment, presumably pulled from either the gear selector itself or another access point to the now quasi-legendary CA025 orange wire found behind the rear seat.


Front end of the vehicle. I'm unsure of whether this yellow video cable terminate into this adapter, which has a unique slot on the video display / head unit or if it has a home in one of the other yellow video cables also eminating from the display/head unit.

 

Can’t say for sure about your extra red wire, but sometimes there’s a wire to tell the camera to do a ‘reverse image’ (flip left to right)

 

Don’t know why, power savings maybe?
Only their engineers would know.
Think there was some discussion about it a few years ago. IIRC, I think in George Kale’s instructions he said you may or may not need the relay to provide clean power to the backup lights. I tried without it, and the lights would flash once and then shut down. Adding the relay solved the issue.

 

Looked at your pictures again and see the rxtra red wire is at both ends of the extension cable, so that wire is to tell the head unit that the car is in reverse and should be connected to the backup lights power.
The red/black pair for powering the camera can either be powered by the backup lights (i.e. camera is only on when the backup lights are on), or can be connected to continuous car power (camera is on whenever the car is on).
The second method would be for the case where you could view the rear camera anytime (see who’s tailgating you).

 

Do I need to connect the red wire to the backup light power (CA023) at both ends or only at one end? It would be good to know before I put the rear seats back in ...

 

I'm not seeing an orange/yellow wire on CA023. I've got red/white, yellow/brown and yellow/green in that color spectrum. Best guess?

 

So the black wire on the video cable contains 2 conductors, signal plus shield?

I ask because it does not look that way in your pic.

 

No - separate dongles near the camera itself.

Black dongle/RCA connector = red & black wires
Yellow dongle/RCA adapter = single yellow RCA adapter + a single red wire flowing from that adapter. I'll pull a pic from above to show you.



I can see where that might be confusing as the red/black wires from the black RCA dongle cross under the main video cable + who-knows-what red wire from the yellow RCA dongle.

 

Sorry that is not what I meant. Forget the red and black connectors. I am ONLY referring to the wires with the yellow RCA terminations. Looks like there is a red and a black wire coming from those. One should be signal and the other should be shield/earth.

UNLESS the black conductor contains 2 additional conductors.

EDIT: the other set of wires for power should
be the one connected to reverse power in the rear junction box.

 

Well, shoot. That changes a bunch of stuff.

The black "wire" from the yellow RCA connector is mirrored at both ends - yellow RCA connector + short red wire. You're telling me that those short red wires are ground only wires?

And if that's the case, then I've got a red/black dongle power setup which needs a different termination point if I only want the camera to power on when the vehicle is in reverse (that is in fact the case). Therefore, I'll need to pull that entire thing past the convertible top through the trunk, into the back seat and then connect the red wire to the ______ (TBD)* wire on the "auxilliary rear junction box" behind the rear set and ground the black one?

* In reading through various threads, I noticed you connected a back up camera power wire to a different place than what Sean / Fly2C are advocating. Still trying to sort through all of the site data and/or get a response back from @Sean W to verify which wire is the magic wire in that aux rear junction box behind the rear seat.

 

Just the end in the trunk, the other end, at the head unit, would connect to an input that, in normal circumstances, would be labeled ‘reverse’ (or something like that).

 

Makes sense, but now @jahummer has me concerned that this is a ground wire. Naturally the vendor's only response was "send me pics of what you've done". Soooo helpful.

 

Think we’re getting Kurt confused here.
The yellow connector is just a normal RCA video connection from the camera, and that plugs into to extension cable to run to the front of the car.
The camera gets its power from the separate red/black pair with the red connector.
The ‘extra’ red wire is a means if letting a head unit know that the car is in reverse.
In Kurt’s case, since he only wants the camera on when the car is in reverse, he can connect the red wire from the power pair to the backup light power, and ground the black wire of that pair. The red wire on the extension (at the back of the car) would also connect to where the red power wire is connected.
The red wire in the end of the extension at the front of the car will connect to the head unit, on some connector to tell it that the car is in reverse.

 

Checking my notes and diagrams.

 

Ok, I connected mine per Jaguar’s factory instructions which have earth to earth and supply connected to the park aid supply which is CA129 WB

 

 

Interesting. Since the park aid would only be active when in reverse, it makes just as much sense as using the backup light. Maybe better, as maybe it has constant instead of pulsing voltage.
So that’s another choice for connecting the red wires in the trunk (camera power, and reverse sense).

 

This was my thread with the retrofit I did..massive disappoint no instructions from your supplier though

https://www.jaguarforums.com/forum/x...08-xkr-198002/

 

Actually reviewing my notes, the power is NOT switched, it is continuous for the camera. This is VERY important as the camera needs to be available at all times. The software logic is supposed to sort when the camera is visible and not visible.