What is the procedure with a multi-meter to connect to my Generac QP75g generator (7200 hrs) so I can adjust the throttle linkage? I just tuned it, new Generac carburetor, adjusted valves, etc., and motor runs perfect but continues to surge when 6 gallon 240v water heater is activated (just flushed with new element). Voltage regulator, new brushes, and new belt replaced last year. I played with the throttle adjustment and it gets much better but I think I may be changing the electrical current and dont want to damage anything. I dont know where to connect multi-meter, nor setting, nor what I am supposed to adjust it to. Any help would be appreciated.