Tim N8DEU, That is great info to know that I can use a G5400 box by simply just adding a 100uf cap to the elevation side for my KR 5400 rotator system, I will keep that in mind! However my question I would still like to know (for our electrical engineers out there) is will a KR-5600 rotator box will work with my KR 5400 system. Attached is the manual for both showing the schematics of both boxes. It seems to me they are both basically the same (according to my very basic schematic knowledge).

Nick KE8AKW