Linda,
If the screen is dark on the Weldex monitor, that's probably your problem, not the camera itself. I lost mine in our Contessa and ordered a new one from RV Cams, Inc. 877-378-2267 (www. RV Cams.com) Cost about $168 in 08 and wasn't too tough to replace (but you have to remove the TV and it isn't light!). Mine went bad because I left it on all the time, rather than turning it off. It will automatically come on when you place the unit in reverse.
Hope you guys stayed dry..
Steve