Pulsating sound and pulsating lights when turned on.
Dewinterizing my LGM. After charging and reconnecting the battery and plugging into shore power, there is a pulsating sound coming from under the sink. When I turn on interior lights, they pulsate and the sound increases. Unplugged from shore and unhooked battery. It is still occurring. I did not go into the trailer prior to reconnecting the battery etc. I had the trailer covered for the winter. Immediately after removing the cover (two days ago) I was in the trailer and did not hear any issue. Ideas? Help?
You don't mention if everything is now working without the disco effects. Very unusual. Anything NOT working?
Might be your water pump trying to pressurize your lines. Might add some water to your tanks and see if it stops.