Voltage Drop - NOT Park Problem

ThruTraffic wrote:
Phoenix Cruiser 2551 30a service

- First noticed it when A/C turns on then stumbles. Voltage at another RV outlet dropped well below 100. Capacitors good. A/C working fine until this point. A/C did trip ITS 20a breaker one time. 30a main held.
- Problem persists when disconnected from shore power and generator running. Main indicator this is an RV wiring problem not shore power delivery system.
- Thermostat threw an E1.
- Inverter monitor behind driver seat threw an E2 and E5.
- Can turn on toaster at one outlet voltage drops 3v
- Can turn on hot water heater voltage drops 3v
- Hooked up a 15a draw elect device drops 5v
- System wide problem
- Checked connections at transfer switch, socket for shore power, junction where old EMS used to be, mains in RV breaker panel. Checked neutrals, grounds and feeds. All tight.

Shore power is my RV lot shop. I can find no voltage issues there even under load. Problem is on the load side of the RV sidewall shore power connector. Even tried different cables and installed a new 30a breaker.

Am I missing any 120v main connections in the RV not listed above?

I’m stumped.

the RV industry is all about skimping and saving a buck here and a buck there to reduce the cost of making a rv so they can make more money. the electrical code is not the same for a rv as it is for a house and combin that with skimping you end up with the cheepest componants you can find and the minimum wire sizes you can get away with, some times smaller than recomended sizes for lenght of runs which causes volatage drop. I think the only way to fix it would be to strip it all and rewire, better quality wire, outlets, and other componants.