There is always a difference of opinion when it comes to the wiring of our campers so please do not take suggestions lightly as we all have our own preferences and your safety is of the utmost importance so B4 you complete the job, B sure to check with the manufacture to insure you have completed the wiring in accordance with their instructions. Call them and/or check with a camper outlet such as Camping World.
Be sure to obtain one of those AC Circuit checkers and use it to check the campground power B4 you connect the camper (C Below). Once that circuit checks OK then connect your camper and check the inside receptacle to insure your camper is wired (120VAC) OK.
Electrical Receptacle Tester with GFCI Diagnosis
Should you not do this and by some chance have a hot wire to the frame, you could shock yourself should you touch the frame while standing outside on the earth.
On our Scamp
5R: The converter AC Side has a wire going from the ground to the chassis (Frame). It also has a wire on the DC side from the White wire to the frame. C the last web site at the very bottom for pictures and instructions.
The electric brakes
has a wire from one side of the connection to the frame and the other wire being the DC Power. As you can see, this unit uses the frame as a ground on both the AC and DC. It also shows that you MUST have a good ground on the tow vehicle to the Whitw Wire in the receptacle and also a good Ground on the camper, White wire to Frame or your electric brakes
may not work. GROUND is a major problem on all trailers and why their running lights dont work. Pay attention to good grounding and you will have less problems in the future.
The Scamp Wiring diagram: See page 13 and the other pages it references.
It shows all AC returns connected together (Green dotted line) and then does not reflect a wire being connected to the frame.
It shows all DC returns connected together (White) and then does not reflect a wire being connected to the frame.
It shows the running lights and all internal DC items sharing the (White) being used as the return (Ground) and does not show a hard wire to ground.
White to Frame: Here is where the White Wire is connected to the frame:
Running lights use the White Wire attached to the chassis in the tow vehicle. This means the chassis of the camper is attached to the tow vehicle ground also when you drop the hitch to the tow vehicle ball. That will apply frame ground on to the camper frame. It is not a good ground because it can come and go at times depending on the physical contact between the hitch components.
Look at the following as it goes in-depth and has a picture of the GROUNDING to the FRAME. John B on another site did an outstanding job of explaining the wiring and the GROUND.
Camper Grounding to Prevent Electrical Schock - Sunline Coach Owner's Club