Here’s how it all started.. At camp hooked up to 30 amp with our 08 Flagstaff (w/ Wfco 8725-P converter) Just running vent fan. Nothing else on. I turned on inside light. Fan slowed and light started to dim. Turn off light and fan sped back up. Turned light on again and everything went out. All three interior lights and fan. Wouldn’t come back on. Fuses all good. I have 13.3 v to lights. I did have to replace 3 speed switch to the fan. So now I have power going to all 3 lights and fan. But fan won’t run and new bulbs won’t illuminate. At home hooked up to 110 w/ adapter. Lights show 13v when running off of battery and 110. Any suggestions/help GREATLY appreciated.