18
6 Cylinder Single Power Buss
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.
** Injector relay switch: We supply a DPDT in event that customer wants to change to a Dual Power
Buss type system in the future. The switch 2
nd
Pole could be left unused, or it could be used for indicator
lights or fed to EFIS for switch position indication. If you change out this switch to a different type, make
sure it has a center Off position!
The more modern Design1 6.25” wide programmer has its own ECU Pri/Bak select key and a LOP key
on its keypad, so no need for a mechanical switch for these two functions..
Several items above do not need switches, but can just turn on with the Main Buss power
switch/contactor.
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 6 5 None No
Injector Relay 6cyl 1 2
1, DPDT** On-Off-On
(Center Off)
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
Mixture Knob relay 1 2 None Not needed
Totals for
6cyl Single
bus.
16
Breakers
Total.
7 Switches
Total *
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