At 11:54 AM 8/20/2016, you wrote: >Ok, so I have my fuel system installed and I am wiring the pumps. They will >have voltage all the time and the ground will be selected to each >pump as it is >selected with a spdt switch. That switch is labeled "pump 1 and >pump 2". That >ground comes from my 5psi oil switch. So that the pump selected will only run >when the engine is running and producing oil pressure. My second switch is to >bypass all that and provide a ground to run the pumps when priming >and starting >and if the oil pressure switch was to fail. How would you label that switch? +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Without extreme justification I'd not have pump #1 run through the oil pressure switch, another failure point. If pump #2 runs without that setup why wire pump #1 that way? Also, I don't like to wire anything "hot" all the time and just switch the ground leg. If the switch to a circuit is turned off I want the circuit to be "dead". I'd use either a DPDT with center "off" labeled "pump 1 (up)" "pump 2 (down)" and (center) "off" or go with a separate SPST switch for each pump. Circuit boards components often switch the ground leg but I don't like external wiring that always remain hot with no means other than a breaker to shut them off. That's just me............. Larry Flesner flesner at frontier.com
