reheostat lighting control

[Gmooney]

I have a 1970 M20C.  The panel lighting control does not work properly.  The lights do come on but stay real low.  Intermittently the  lights will come on high but will not stay.  I have replaced the fuses and inspected the control unit.  I think the rheostat control is bad but cannot find a replacement or a model number.   A couple people have recommend the Max pulse units but I am not sure if that unit will match ohms and resistance.  The rheostat control seems integrated into the lighting control panel. 

 

I have considered replacing the whole lighting system but the existing system provide back lighting to various places on the panel and instruments and not sure what would work. 

[Mooneymite]

I have no suggestions other than suspecting corrosion, but if you're rheostat is like mine, those ity-bity fuses are pretty expensive! I wonder why a more "standard fuse" was not used.

[M20F-1968]

I have the original rheostat controls from a 1967 F model.  I am sure they are the same as yours.  If you are interested, please call me at (617) 877-0025 or e-mail me at johnabreda@yahoo.com

 

Thanks,

John Breda

[meddesign]

70E   I had to replace the reostat, but could not get the one with the on off switch built in, Ended up adding a milspec toggle switch for on off.    I also rebuilt the lighting board, I changed the fuses to a different type.  I was told by Bill Wheat the diagram in the manual was the latest revision.

[mike_elliott]

You might consider pulling the whole module and sending it to Don Maxwell, he has a guy that can fix these things..

[Gmooney]

It has an allen bradley type JS 2A 125V 10A 10V reheostat  Can't tell how many OHMS with a resistor cross connected. I might give the guy at Don Maxwell a call on this but found on ebay some units that might work.