Reading his post got me thinking. Maybe I could use the same little PWM motor controller box that I used a mod for adjusting the bathroom fan speed as a light dimmer. We have a 12V light fixture directly over our bed’s headboard. Being so close, it’s a little bright. Anne is a late-night reader, and I’m sure she would appreciate the ability to adjust that lights brightness.
In this video, I first bench test the concept using my little Jackery 500 power box as the 12VDC power source. Once I had proof of concept, I went to work installing the PWM power controller box into the RV ceiling area and splicing it into the existing 12VDC supply wires.
I added a 3 amp inline fuse just for extra safety and also tested it functioning at full power for an hour or so before sewing everything up. I wanted to make sure the box didn’t get hot. Being that it’s rated at 9-60 VDC and up to 20 amps, the meager 1.5 amp current the lamp required created virtually no heating. The actual light bulb produced far more.
Disclaimer: Working with electricity can be dangerous. I’m not a certified RV technician, merely an RV owner. This post and video should not be taken as instructional. If you decide to do a similar type mod as depicted in the video, do the research and be aware of all the risks involved. I accept no liability; you have been warned. – Ray
Video Detailing my RV 12V Light Dimmer Mod
I found the PWM controller I chose worked better for the OEM incandescent lamps versus my aftermarket Starlights LED lamps. The LED light only dimmed in a small range at the end of the adjustment control versus the incandescent, which had a more linear smooth dimming action. So I decided to swap that fixture back to the old school incandescent bulb.
This mod has turned out to be a big hit with my wife, Anne. She gave it a try last night and loved it. Great for her late-night reading and nice not to be blinded by the bright light when going to bed or getting up during the night.