I have been checking the wiring almost all day. The camper 12v wiring comes off of the house battery. Those wires are all a combination of one blue and one green (can't tell if they are 14ga or 16ga) to each fixture. Those two wires and the black and white wires from the water pump go directly to the house battery pos/neg posts. This battery is NOT grounded to the frame.
The exterior clearance/stop/tail lights are a different story. They ARE grounded to the frame and power is provided (as we all know) by the towing vehicle. They are not being discussed at this time.
The 110v system is provided by plugging in (extension-cord-type) 20 amp cable into a standard outlet. The other ends of the wires are wired to a simple breaker box. Now I assume this box is only grounded by the green wire from the cord; the white to common and the black is attached to the circuit breaker. The rest of the circuit uses Romex-type house wiring. I have searched under, over and through the trailer and canNOT find where the 110v ground is used on the frame.
Hence, the PD 9245 says to attach the "grounding lug" on the converter to the "chassis ground". Why? It is not grounding anywhere on this trailer.
Hence you see my issue with 12v systems.
. Thanks for what appears to be the easy way to do this.
Paul R. Haller
. Thanks for your assistance. The key word here being "modern", which this trailer is not.
. Thanks for your input. Laziness prevents us from taking the inexpensive, sane way of doing things.