front view camera issue

I am installing a Front View Camera.  I tested the camera and it works on my television when I connect it using a wireless system.  When I connect it using Video Cable, it does not work.  Seller I purchased it from says that the Cable must be bad.  I have tried other cables and it still does not work.  Anyone have any ideas what is wrong?  Any help would be greatly appreciated. 

Without a make and model# of the camera system, is probably why there is no response. People need that to be able to look it up and see what the options are.

This is a generic no-name cheapo camera I purchased on eBay.  I was hoping someone might know what the issue might be. I checked the conductivity of the video wire and it was fine. 

    Is it possible the camera is PAL and won't work with the wire because my monitor is NTCS?

    Is it possible the wireless system converts the camera to NTSC, and that is wy it works.

The wireless system does no conversion. The camera is NTSC (assuming the cabled monitor/TV is dedicated to NTSC).    Are you using the camera's receiver into the TV/monitor?

I don't know what you mean by "Camera's Receiver" ? 

I have 12 volts DC powering the camera  with the wireless transmiter connected to the camera and the wireless receiver connected to the monitor.  That works!

When I remove the Wireless system and replace it with the RCA cable, power connected the same way, it does not work.

Sorry - I thought it worked with the cable but not wireless. My bad! (By "Camera's Receiver" I meant the wireless receiver you connected to the monitor.) If other cables that are known to be good have been tried, I'd say it's a faulty camera - maybe as simple as a poor or broken wire to its connector.