The plunger switch in my Monty turns on 3 ceiling lights in the kitchen area. Things to check: 1) are the switches on the ceiling lights turned on? 2) is the plunger switch still functioning? The plunger switch is a 5 amp switch. In my Monty with 3 two-bulb pancake lights connected to it, the total current draw was 7 amps. The result: the switch had two heat-related failures before I replaced the 3 pancake lights with LED type and then replaced the switch for what I hope is the last time. Current draw with 3 LED lights is just under one amp. Of course, all of this assumes that the bulbs in the ceiling lights are good.
2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank. DieselSite water separator/fuel filter.