Still having issues and I appreciate the replies.
I made a neutral-ground bond plug and plugged it into one of the 15A plugs on my Champion 3500. Tried again last night. Warmed up generator for 5+ minutes with Eco mode off. Fifth wheel with 2 12V batteries has been plugged in for 3 days after a week and a half of storage. Plus charged batteries for 3 hours with 10A charger prior to test. Nothing turned on in trailer, just parasitic draws and batteries charging. Plugged trailer to generator with sun aleady set and 80-85 degrees. SurgeGuard kicked in after startup delay, all indicator lights normal and I it left in this state for 5 minutes with no fault from SurgeGuard. Turned on Dometic 15K AC with minimal engine draw-down on generator (no Over-load warning light). SurgeGuard faults after about 10 seconds of AC running. Previously the SurgeGuard fault consisted of a single, loud click. This time it was a series of about 5 cycles of quieter click and louder click. Same as before, Line 1 and Line 2 lights on SurgeGuard remain green and Delay/Caution light flashes red after the fault and power cutout. According to the SurgeGuard manual, this warning light state indicates reverse polarity, open ground, or voltage on ground.
Others here have stated it sounds like a low voltage scenario, although an over or under voltage indication would be 2 red lights and flashing Caution light on the SurgeGuard. Prior to generator purchase I read many, many accounts here and on Champion reviews that a 3100 will run a modern 15K AC with no issues. Some have said a 2800 will run a 15K. So I bought a 3500 to have extra assurance and capacity. This 3500 generator barely draws down when the AC starts. I recently sold an Arctic Fox truck camper and I had a Honda 2000 that would run the 11K AC. It would drag down to its knees on startup, so I know what that sounds like. I have a hard time thinking this could be a low voltage issue unless the generator is defective or the SurgeGuard is defective. I'm an engineer, but not an electrical engineer, so I may need a repair shop to trouble shoot this one for me.
