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Picture of the Holley Sniper EFI System

Wiring the Holley Sniper EFI

Until recently, electronic fuel injection was completely out of the hands of your typical automotive enthusiast.  Over the past years, many different companies have introduced powerful and elegant systems to bring the benefits of EFI to anyone.  Holley recently introduced their Sniper EFI system.  This is a cost-effective EFI system that can handle up to 650 horsepower and can be tuned without a laptop.  Wiring the Holley Sniper EFI system is a breeze with our Infinitybox 10-Circuit or 20-Circuit Kits.  This blog post will take you through the details.

Our Infinitybox system can interface with any electronic fuel injection system in the market.  Wiring the Holley Sniper EFI is as simple as wiring their Terminator or their Dominator.  Click on this link to get to the details of wiring the Holley Terminator.  Click on this link to get to the details of wiring the Holley Dominator.

Before you start wiring the Holley Sniper EFI, you must thoroughly read and understand the instructions that came with your kit.  This link will take you to the Holley manual.  Note that this blog post is just going to cover wiring ignition power from your Infinitybox system and wiring the fuel pump & cooling fan.  The Holley manual will cover the rest of the wiring details.

This diagram shows you the connections between your Holley Sniper EFI and your Infinitybox system.

Picture of the Infinitybox wiring diagram showing how to wire the Holley Sniper EFI System with the Infinitybox 20-Circuit Kit

Picture of the Infinitybox wiring diagram showing how to wire the Holley Sniper EFI System with the Infinitybox 20-Circuit Kit

First things first, you need to get battery power and ground to the Sniper.  The red wire in their 7-pin connector must go directly to the positive terminal on your battery.  The black wire in their 7-pin connector must go to ground.  As we discussed in other blog posts, 90% of all electrical problems relate to a bad ground.  Make sure that you have a solid metal-to-metal connection to your chassis with no paint, grease, powder coating or dirt in the way.

Next, you need to bring ignition power from your POWERCELL to the pink wire on their 7-pin harness.  In most Infinitybox systems, this is the light-green wire on your front POWERCELL but check your configuration to be sure.  This POWERCELL output will supply battery power to the Sniper whenever you have the ignition switch on.

Next, you need to connect your MASTERCELL input for your cooling fan to the light-blue wire on the Sniper 10-pin harness.  You must install a diode in series between the MASTERCELL input and the cooling fan trigger on the Holley harness.  We recommend a 1N4001 diode.  Note that the orientation of this diode is critical.  Check the diagram above for the correct orientation of the stripe on the diode.

There are several advantages to using the Infinitybox system to control the cooling fan directly off of the Sniper harness.  First, you do not need to add a relay.  That is built into the POWERCELL.  Second, our cooling fan outputs are set to soft-start the motor.  Click here to learn more about the benefits of soft-starting.

Next, it is time to wire the fuel pump.  The dark-blue wire on the 7-pin connector is the fuel pump trigger.  This is a 12-volt signal so it cannot be directly connected to the MASTERCELL input for the fuel pump.  You must use an inVERT Mini to flip this 12-volt signal to a ground signal for the MASTERCELL.  This link will get you more details on the inVERT Mini.  The diagram above will show you how to wire the inVERT Mini between the Sniper EFI harness and your MASTERCELL input.

There are several advantages of using the Infinitybox system to control the fuel pump directly from the Sniper harness.  First, we can disable the fuel pump as a security measure if you have our inLINK Radio upgrade.  More importantly, having the Infinitybox system control the fuel pump means that you  have to run less wire in the car.  The MASTERCELL is located close to the EFI system.  The rear POWERCELL is mounted near the fuel pump in the tank.  There is no extra fuel pump wiring required to make it work.

One quick note about the Sniper if you are using our One-Button Start feature.  It takes their system 2.5-seconds to boot up.  It is only after that time that the fuel-pump will start to prime.  Our standard One-Button Start feature is set for a 1-second fuel pump prime.  We can easily extend our fuel pump prime time to accommodate the timing required for the Sniper EFI system.  Please talk to Infinitybox technical support when you place your order to make this change.

Wiring the Holley Sniper EFI system with your Infinitybox 20-Circuit Kit will get you all of the functionality that you need to control your engine.  You can download a PDF of our wiring diagram by clicking this link.

Click this link to contact our team with any questions about how our Infinitybox system can streamline your wiring projects.

Holley Terminator EFI

Our Infinitybox system can power any ignition and fuel injection system out there.  We recently received a request for a wiring diagram for the Holley Terminator EFI system.  We’ve blogged before about the Dominator and given detailed instructions on how to wire that system with our 20-Circuit Kit.  You can see that here.  This post will cover how to connect to the Holley Terminator EFI system with our 20-Circuit Kit.

Holley ECU

Holley ECU

Holley Terminator EFI System

This link will take you to more information on the Holley Terminator EFI system.  

Our Infinitybox 20-Circuit Kit is going to provide the ignition power to the Holley ECU.  It is also going to take the fuel pump trigger signal from their ECU and the cooling fan trigger.  These two triggers will go to the MASTERCELL which will send signals to the POWERCELL in the front of the car for the cooling fan and the POWERCELL in rear of the car for the fuel pump.  This eliminates the need to add external relays because they are switched from inside the POWERCELLs.  This also eliminates the need to run high-current wiring from the Holley Terminator EFI system to the front and back of the car.  Those signals are sent through our CAN cable.

Before we go any farther, it is very important that you completely read and fully understand the manual that came with your Holley Terminator EFI system.  There are many different parts of properly installing this system, the wiring is just one step.

Once you have read and understand their manual, you must make all of the constant power and ground connections necessary for their system to work.  There are multiple constant power feeds that must be wired directly to the battery and multiple ground connections.  You must also wire in all of the other connections including the coil, tach, O2 sensors, etc.  Their manual will cover these details.

As an overview, here are the points where your 20-Circuit Kit will connect to the Holley Terminator EFI system.

  1. The ignition output on your POWERCELL will supply the key-on power to their system.
  2. Their system will trigger the fuel pump output on your rear POWERCELL from the MASTERCELL.
  3. Their system will trigger the cooling fan output on your front POWERCELL from the MASTERCELL.

This picture shows you the overview of the connections between your Infinitybox 20-Circuit Kit and the Holley Terminator EFI system.

Picture of Infinitybox wiring diagram showing how to wire the Holley Terminator with the 20-Circuit Kit.

Picture of Infinitybox wiring diagram showing how to wire the Holley Terminator with the 20-Circuit Kit.

You can download a PDF of this wiring diagram by clicking this link.

Let’s start with the key-on ignition power.  Check your configuration sheet and find the ignition output wire.  In most cases, this is the light-green wire on the front POWERCELL.  System configurations may vary so check the configuration sheet that came with your kit.  The POWERCELL ignition output wire is going to connect to the red wire with the white stripe in the Holley ECU harness.

Next, you need to connect the fuel pump trigger.  In the ECU harness, there is a green fuel pump wire.  This wire supplies 12-volts to drive a pump directly or to drive a relay coil.  To connect this to the MASTERCELL input, you must convert this 12-volt signal to a ground signal.  You can do this with one of our inVERT Mini’s.  Alternately, you can use a relay to flip this 12-volt signal to a ground signal for the MASTERCELL.  This link will take you to a diagram showing you how to use a relay if you don’t want to use an inVERT Mini.

Check the configuration sheet that came with your kit.  Find the MASTERCELL input wire for your fuel-pump.  In most cases this is input 19 which is the tan wire with the yellow stripe.  Check your configuration sheet to confirm this as different systems may have different wire colors.

Lastly, you need to wire the cooling fan trigger from the Holley Terminator EFI system to your MASTERCELL.  Check your configuration sheet for the color of this wire.  In most systems it is the blue wire with the yellow tracer.

There are additional outputs on the Holley harness.  The gray wire with the black stripe is the cooling fan trigger.  This is a ground-switched signal so you do not need to flip it to connect it to the MASTERCELL.  However, we do recommend using a diode to eliminate the chance of surges coming into the MASTERCELL inputs from the ECU.  A 1N4001 diode will do the job.  You can get these from any electronics source.  Please note that the orientation of the diode is very important.  The stripe on the diode should be on the ECU side of the connection, facing away from the MASTERCELL.

That’s it.  When you turn the key, the front POWERCELL is going to apply battery power to the ignition input on the Holley Terminator EFI system.  When the Terminator wants the fuel pump to turn on, it will send a signal to the MASTERCELL, which will control the fuel pump through the rear POWERCELL.  When the Terminator wants to turn the cooling fan on, it will send a signal to the MASTERCELL.  The MASTERCELL will tell the front POWERCELL to turn on the cooling fan.

If you have questions about wiring diagram or wiring anything else with our Infinitybox system, click on this link to contact a member of our team.

Wiring the Holley Dominator EFI System

EFI systems have been gaining in popularity for years.  Guys want the conveniences, flexibility and power that they get from the engines in modern cars.  Companies have been leveraging technology developed by the large OEMs to bring Electronic Fuel Injection systems to restorations, hot-rods, street rods, resto-mods and component cars.  Our Infinitybox system does the same thing.  We take technology used in practically every new car and bring it to the average guy in his garage.  He gets the conveniences of less wire, more diagnostics and better functionality out of his wiring system.

It is very easy for us to bring the two systems together:  Infinitybox powering EFI.  This is a question that we get a lot.  How do I connect my Infinitybox system to my EFI system?  This post shows you how to connect the Holley Dominator EFI System to the Infinitybox 20-Circuit System.

First things first, Holley has some very important notes and warnings about wiring their system.  Be sure to read their manual thoroughly and follow their instructions.  The most important things are related to good grounds and keeping all signal & data wires away from the coil wires.

You are going to wire the Dominator following their instructions.  There are two simple differences when you connect in the Infinitybox system.

Image of wiring diagram showing how to wire the Holley Dominator EFI System with the Infinitybox System.

Image of wiring diagram showing how to wire the Holley Dominator EFI System with the Infinitybox System.

First, you are going to give the Dominator its key-on power from the Ignition output on the front POWERCELL.  You going to connect the ignition switch to the ignition input on the MASTERCELL.  When you turn on the ignition switch, the MASTERCELL sends a command to one of the POWERCELLs, usually the front, to provide battery voltage to the ignition output.  This is usually the light-green output on the front POWERCELL but always refer to the configuration sheet that came with your Infinitybox kit.

Next, you are going to use the Infinitybox system to power the fuel pump.  There are several advantages to doing this.  First, the Dominator fuel pump output is only capable of delivering 10-amps.  In most cases, you’d need to add a relay to switch the current to the pump.  The POWERCELL is the relay and it is capable of delivering 25-amps.  You won’t need to add a relay for most commercially available pumps.  Second, the fuel pump is switched from the rear POWERCELL, which is mounted in the rear of the car.  You don’t have to run any extra fuel pump wires to the back of the car.  You just wire the fuel pump from the rear POWERCELL.

There is an important warning that must be followed when you wire MASTERCELL inputs to other controllers, like EFI systems.  MASTERCELL inputs are designed to be connected to ground.  This lets us keep the wire bundles small and simplify how you connect to switches.  Applying 12-volts to a MASTERCELL input will damage the Cell and will void its warranty.

In the case of the Holley Dominator EFI system, it puts out 12-volts for the fuel pump trigger.  You can simply convert this 12-volt trigger to a ground trigger with one of our inVERT Mini modules or a relay.  The application note that we created for the Holley Dominator EFI system shows using an inVERT Mini.  You can download a simple wiring diagram showing you how to do this with a relay by clicking this link.

You can download a PDF of the application note that shows how to wire the Holley Dominator EFI system with the Infinitybox 20-Circuit Harness by clicking this link.

If you have any questions, please feel free to contact our technical support group at (847) 232-1991 or email us at sales@infinitybox.com.  You can contact our team directly by clicking this link.