reversing camera

I went through this in my Kingham and added this post:

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I am still happy. The twin lens brake light camera works well both for reversing and as a full time rear view mirror. The image is slightly distorted in that following vehicles appear lower than they are, but is absolutely fine for purpose.

I was unsure whether our problem was with the camera, the cabling or the monitor but elected to go for a complete new twin lens unit which was not that much more expensive than fiddling around changing various units, and no problems with compatibility of connections etc. Running a new cable through the van was surprisingly easy. I did not try and follow the original route but devised my own through the van interior. No new holes were drilled inside or outside, just one existing hole in the rear door frame reamed out a bit. The old camera was just abandoned in place.

That was my problem! Unless you are well up on these sorts of issues you will not be able to test the individual units. I do most things but not electronics! You could pay a professional, but even then the modern trend is to just plug in replacement units until the system works, and bill accordingly. Unless the issue is very simple (bad connection?) you may end up spending more money (if no warranty cover of course). My complete replacement was very easy, needed no drilling, no soldering and I now have a twin lens continuous rear view camera rather than a single lens limited view reversing (only) camera.