I could use some help. As stated in the post above there is a strange interaction between the PWM fan control and the LED light strips that I installed. The LED vendor has been fantastic (pun intended) and replaced the LED bar with the hand wave sensor in it without question. Not wanting to push my luck, I have left it alone for now, and installed a separate push button controlled dimmer/switch from the same vendor. It works fine.
However! When the lights are OFF, if I use the PWM speed control on the fan and turn it to extremely low, the LED lights come on again (at their dimmest level).
I started investigating this today. I was thinking there might be a ground problem in the roof/ceiling wiring. This is the one area of the camper I left stock when I gutted/rebuilt my Puma. I used a length of wire that was grounded to the house batteries at one end, and used it to provide a solid ground at various points in the circuit.
1) No effect when grounding the white ground wire coming out of the ceiling to the fan
2) Grounding the white wire when it comes "out" of the PWM puts the fan at high speed... so the PWM is modifying the ground, not the power wire? Interesting.
3) Probing the ground side of the connection to the LED light bars puts them at full on as well. So the dimmer there also modifies ground vs power. Doubly interesting.
I'm stumped. I assume that somehow the PWM is changing the "relative" level of ground for the lights, and thought that adding a solid ground would fix that.
My next test will be doing much the same but with a jumper wire connected to the +ve terminal on the house batteries.