16
4 Cylinder
Switches and Breakers recommendations, Dual ECU
*** If Dual ECU using older round 3-1/8” programmer, add 1 more switch for ecu select, and if LOP
operation will be used, add 1 more switch again to arrive at a total of 9 switches. Add one 2A breaker for
the Fault LED light for a total of 14 Breakers.
The more modern Design1 6.25” wide programmer has its own ECU Pri/Bak select key and a LOP key
on its keypad.
Several items above do not need switches, but can just turn on with the Main Buss power
switch/contactor.
Some of the above options may not be needed such as the Octane Switch or Closed Loop switch so this
will change the total number of switches required.
Fuel pumps and ignition coils need dedicated switches to allow for individual function testing or “mag
check”.
Item Breakers
Quantity
Breaker
Amps
Switches
Quantity
Switch
included in
system
Fuel Pumps 2 15 2, SPST No
ECUs 2 2 Optional, SPST No
Ignition Coils 2 10 2, SPST No
Injectors 4 5 None Not needed
Injector Relays 1 2 1, to ground SPST Yes
Wideband
Controller
1 5
None. Relay
control through Pin
1 on 16 pin Molex
Not needed
Octane Select 0
None, switches ecu
input to ground.
1, SPST. Pin 10 on
16 pin Molex, switch
to ground.
No
SDS Card Logger 1 2 No Not needed
Closed Loop
Quick Enable/
Disable Switch
0
None, switches ecu
input to ground.
1, SPST, Pin 9 on 16
pin Molex, switch to
ground.
No
Totals 13 Breakers
Total***.
7 Switches
Total ***.
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