Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 13)

Black/White wire
from BS3 harness
labeled “Primary
Fuel Pump (LS)”
Standard 40 Amp relay
text
te
x
t
Battery or
Vehicle
Chassis
Ground
Fuel Pump
+
Battery
+
-
text
te
xt
Switched 12 Volt
Line
Vehicle
Chassis
Ground
Relay
86
30
85
87
87a