RE: Ernst Charge Receptacle...?
I use the [link=http://www.maxxprod.com/mpi/mpi-4.html]SOFT MOUNT ONE-PIECE CHARGE SWITCH with LED VOLTAGE DISPLAY [/link] from Maxx products. One had a rather violent incident with the ground and won - it still works but has a section of the case broken off. I haven't heard of any problems with these, but they are expensive. I like the build-in LED which so far has proven accurate when I've double check with a loaded volt meter.
Hogflyer