LED bulbs

When your MH was wired, the person screwed up and reversed the wire connections going to the one side of your MH lights and it may be easy or hard to find or get at where the screw up occurred as it may be behind a wall or ceiling panel. If you use a VOM etc meter, you may be able to find where it occured and be able to correct it quite easily, unless it's hidden.

Not the first time by far an owner has found this issue in RV's and sure won't be the last. LED's are quite new on the scene in the RV industry and before them, light bulb current flow polarity wasn't that critical for only incandescent bulb use but was certainly against RVIA and commonsense rules and acceptance. Some of the workers in the RV industry are not well enough educated to know the difference as they are often entry level employees and this is their first experience with this type of work. A shame as RV's are not cheap throw aways. Inncorrect wiring is and can be a serious fatal fire hazzard anytime and it must be corrected ASAP.

Because an incandescent bulb has a resistance filament that heats up to the light level output whether it's wired positive ground or negative ground. As long as there's an active DC current of both positive and negative connection for flow thru the bulb filament, the bulb will illuminate. The center of the bulb socket can be either positive or negative as long as the tubular outer of the bulb socket is the opposite polarity the electrical circuit is completed.

Thank you for the info.

Incandescent bulbs do not care about polarity, LEDs do.

Incandescent bulbs are not polarity sensitive, while LED bulbs are.

Ed Headington

If it were the polarity why would the 1141 bulbs work but not the LED?

You are going to have to find where the wires are reversed on that side and switch to the correct polarity.

I would check the polarity- one side could be wired backwards.