207WF Posted April 29, 2014 Report Share Posted April 29, 2014 Link to comment Share on other sites More sharing options...
207WF Posted April 29, 2014 Author Report Share Posted April 29, 2014 Its the round rheostat in the center of the photo. Anyone know of a source? It seems to have failed internally. WF Link to comment Share on other sites More sharing options...
Roger Lee Posted April 29, 2014 Report Share Posted April 29, 2014 I have not had to replace one yet, but I would think these are fairly common and can be had at Radio Shack or an electronics store. Link to comment Share on other sites More sharing options...
Anticept Posted April 30, 2014 Report Share Posted April 30, 2014 What are the symptoms? I ask because you can strip the cheap plastic splines off and it may SEEM like it's broken. Link to comment Share on other sites More sharing options...
Doug G. Posted April 30, 2014 Report Share Posted April 30, 2014 I am not certain mine does anything. The only thing I can think of is if the compass is lighted. I've never noticed if it is or not. Link to comment Share on other sites More sharing options...
coppercity Posted April 30, 2014 Report Share Posted April 30, 2014 It should control the brightness of the light strip above the electrical switches, the lights in the wing root for the fuel sight tubes, the compass and the light rings on the analog gauges if they are installed. It only works if your navigation/position lights are on though. Link to comment Share on other sites More sharing options...
Anticept Posted April 30, 2014 Report Share Posted April 30, 2014 I would need to look inside at the wiring, but in some aircraft installations, the rheostat is connected to the base of an NPN transistor. This is so that if the rheostat fails, the lighting will go full bright. That's why I am asking for symptoms, so I would know what to look for to cut down on research. Link to comment Share on other sites More sharing options...
207WF Posted April 30, 2014 Author Report Share Posted April 30, 2014 There is an on-off position with a click; you turn it on then further clockwise to brighten the lights. The on-off position seems to "slip" around in a circle, retreating away from my attempts to click it off counter clockwise. I looked in the back and saw nothing loose. I am leaving it on, at the dimmest possible position, until I can get it fixed for fear that it might not turn on some time when I need it. WF Link to comment Share on other sites More sharing options...
Doug G. Posted April 30, 2014 Report Share Posted April 30, 2014 Hmm...I need to go out to my hanger, keep the lights off and check this out. I wonder if the CTLS is different. Link to comment Share on other sites More sharing options...
cdarza Posted April 30, 2014 Report Share Posted April 30, 2014 Is that a new style 'switch' for the master batt and gen ? Link to comment Share on other sites More sharing options...
Roger Lee Posted April 30, 2014 Report Share Posted April 30, 2014 The knob that Wayne is referring to only turns on the back light for the instruments, the small led lights up by the fuel sight tubes and back lights for the radio and transponder. It is for night time illumination. Link to comment Share on other sites More sharing options...
Anticept Posted April 30, 2014 Report Share Posted April 30, 2014 There is an on-off position with a click; you turn it on then further clockwise to brighten the lights. The on-off position seems to "slip" around in a circle, retreating away from my attempts to click it off counter clockwise. I looked in the back and saw nothing loose. I am leaving it on, at the dimmest possible position, until I can get it fixed for fear that it might not turn on some time when I need it. WF Pull the knob off and make sure the splines aren't stripped. Mine is stripped and I can't turn the lights off. Link to comment Share on other sites More sharing options...
Roger Lee Posted April 30, 2014 Report Share Posted April 30, 2014 I take my Dremel and sand down a flat spot on one side. Then when you screw the set screw back in place over the flat spot it won't ever strip or turn. Link to comment Share on other sites More sharing options...
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