2018 Greyhawk

[Florida Ranger]

What do I need to do/ disconnect before Welding on Chassis Frame. I do not want to mess up any of my electrical on Motorhome .

[CAG]

Why are you welding on the frame? Some more specific info might help here.

[Florida Ranger]

Hydraulic leveling pump needs a new bracket. Do not want to wait on Jayco.

[mini4mw]

When I had a friend add a piece of metal for my hydraulic support he said the below which matches what others have mentioned relating to welding. I don't weld, but this is what we did when I watched him fixing up my unit. Remember, finding and fixing something fried is much more expensive than having someone do it that has experience.

For any welding, disconnect the chassis/engine battery, the house battery, incoming solar power and street power. No voltage anywhere incoming/usable.

When you are welding, put the clamp as close to the location you are welding as possible so the volt/amps take the path of least resistance/shortest path from the rod to the clamp. Make sure the area clamped on to is clean direct metal. No paint, debris, etc.

[ChristopherW]

I welded additional support for my spare tire carrier under the Greyhawk and since I disconnected everything, I had no problems. You will probably lose any stored radio stations so you may take note of what they are. Engine codes i.e. smog device codes may be lost so you may not pass a smog test until driving it for a while so the system can reset.
Good Luck