Voltage Drop - NOT Park Problem

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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.

[BB_TX]

Certainly sounds like a point of poor connection in your incoming power. V=IR or voltage drop is equal to current times resistance.. Example: if you had a poor connection of 1 ohm resistance with 1 amp current flowing thru it you would have a 1 volt drop, or loss, at that point. If you increased the current to 2 amps then you would have a 2 volt drop at that same point. That sounds like what you are seeing. You would also have localized heating at that point.

Looks like you have already covered all the obvious. You might look again at those connection points to see if crimps or clamps are partially on the insulation. Another possibility is partially broken wire. That can sometimes be hard to find as sometimes it happens inside insulation with no apparent damage.

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Lwiddis wrote:
Age of the RV and the converter?

Both 2011. I'm not seeing any problems with the 12v system. I had the cover off the converter tightening logs. None were loose.

[Lwiddis]

Age of the RV and the converter?