In my attempts to improve the efficiency of my old Dometic, I added a small
interior fan, a larger rear fan, and an manual override switch for the rear
fan.

I just noticed that if one or both of the fans is on, I get a "false
positive" flame light.  In other words, the green light indicating flame is
glowing even if the flame isn't.  Turning off the fan(s), it still works
correctly.

I'm a "by guess and by God" kind of electrician, so I'm guessing that I
inadvertantly tapped into the wrong live wire (it is yellow) when looking
for an electrical supply on the refrigerators top electrical panel.  Can
anyone help me understand what I did wrong and how to find a live wire that
won't affect anything else negatively?  If it helps, the ground I tapped
into was blue.

Thanks,
Paul