i have recently switched to the multiplex wiring setup in my installs and have been looking into car pc instalation for awhile

heres the deal i figured out basically all i would need but lack one answer.....the system i use is controlled by grounds not positives and uses mosfets to switch power to different circuits eliminating relays..were talking about milla amps so nothing to harsh to trigger

SO WHAT DO THE RELAY CARDS PRODUCE GROUND OR POSITIVE?