Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 14)

Red/White wire
from BS3 harness
labeled “Secondary
Fuel Pump HS”
Standard 40 Amp relay
Fuel Pump
+
text
text
Battery or
Vehicle
Chassis
Ground
Battery
+
-
text
te
xt
text
te
xt
Vehicle
Chassis
Ground
Battery or Vehicle Chassis Ground
Relay
86
30
85
87
87a