@Windy City posted:Please explain how isolating relay #1 effects the SC-2. Are you not using relay #1 after isolating it?
Relay #1 has it's common connected to the aux power ground. This was to allow the O22 switch to power the SC-2 directly and not require aux power. However, for use with accessories, this is a problem, so I cut that trace and provide the SC-2 with aux power and free up the relay for normal use. Once this trace is cut, all the relays are available and totally isolated from anything connection from AUX power. I most certainly am using all six relays.