Interior lights go dim while water pump runs, on my 2017 Salem hemisphere 24bhhl

[stigy1877]

Three times now we have had the lights go dim or almost out when the water pump starts running.

[rsdata]

short quick answer is either your 12 volt battery is discharged or the fuse near the battery close to the tongue is popped.

Assuming you are plugged into 120V shore power... then it may be the fuse. If only on battery power then certainly a nearly discharged battery.

Follow the POS wire from the battery into an electrical box that hides a fuse with a tiny black push button. Push the button to reset the fuse.