My 753 has a 1/2" x 1/2" button w/ two small bulbs on an aluminum plate just below the key/start switch that you'd push to energize the solenoids that control the flow to the couplers. The trigger in the front of the right stick opens one way for continuous flow and needs to be tripped again to...
1st post so guess it'll show, anyway auxiliary switch has been surrounded by a mouse nest enough the urine or what ever they do in there has compromised the switch's function,IMO. The light's feeds from the control board inside the switch have rotted off so the light don't work (not so much the...