DIY: How to Install a Ground Wiring Kit in your Car, Big 3 Update - Performance DIY by DIY Guru

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DIY: How to Install a Ground Wiring Kit in your Car, Big 3 Update

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This tutorial will be instructing you on how to make your own ground wire or Big 3 kit, as well as the whole installation process.
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Before we delve deeper into the tutorial. Let us look at the benefits of a ground wire or big 3 kit. Firstly, you shouldn't be expecting substantial horsepower gains. You can rather expect a smoother idling engine and an improved throttle response. Brighter headlights and cleaner audio has also been experienced by some diyers.
Some guys even claim that  the ground wires prevent static shocks when getting out of the car.

Also, We checked the voltage differences beforehand at  planned grounding points using a recently calibrated Fluke 87 multimeter. Here is a table of the before/after voltage differences with the ground wires made in this tutorial:

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Voltage Readings

Planning the Grounding Points

The DIY ground wire system we will make and install, dubbed the "Ill save money on mechanic bills," consists of 4 wires connecting 5 points.
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Big 3 DIY

Body (A) > Head (B) > Coil Pack (C) > Battery Negative (D) > Body (E)

You can choose your own ground points as well, but you will be on your own with that. Choose your grounding big 3 points wisely and at your own risk. In case you decide to choose your own ground points, get some string and measure those points. Measure with strings to figure out how exactly much wire is needed. Similarly different gauge wires can be used. Most aftermarket kits are 4-gauge.

For the "Ill save money on mechanic bills kit" you will need:
- Wire cutters/crimper/scissors/pliers
- Socket wrench (10mm socket)
- 7' of-8 gauge speaker wire (81" for the kit, 3" left over)
- 10 pieces of 8-gauge ring connectors (5/16" hole)
- About 1' of heatshrink tubing that will fit over the crimped ring connector and wire
- A lighter (for the heatshrink)

Preparing the Ground Wires for your Big 3 Update:

1. Cut the wires into the lengths needed.
Big 3, Ground wiring DIY
Big 3 DIY
Big 3 Update


2: Once You have finished cutting the wires , use a pair of wire strippers (or  scissors) to strip about 1/2" off of the wire insulation to make way for the ring connector. Try not to cut the copper bit of the wires. If a few strands end up getting cut, it's okay. However, if half the strands are wasted, you will have to do it again. There should be enough slack in the wire for mess ups. To prevent fraying twist the wire strands into a rope. Repeat this step for the other side of the wire.
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BIG 3 DIY
BIG 3 DIY

3. Once you have stripped off the insulation, slide on 2 pieces of heat-shrink on to the wires. The length of the heat-shrink should be sufficient to cover (and overlap) the crimp-able area of the ring connectors. With the heat-shrink out of the way, slide on the ring connector onto the wire firmly.
Big 3 DIY

4. Using a pair of wire crimpers (or stripper/pliers), crimp the ring connector, and then follow through until the whole connector is crimped. Make sure that the 2 pieces of heat-shrink are still tight  on the wire, and then repeat this step for the other side. Double-check the crimps for tightness. Refrain from pulling on the ring-connectors. Just make sure the crimps are tight by re-crimping them. Slide the heat-shrink onto the crimped area of the ring connector. Make sure the hole is not covered, and then use the lighter to activate the heat-shrink.
BIG 3 DIY

5. Repeat steps 2 to 4 until for all four wires . Once all of them are done, you should have a kit that looks like this:
big 3 update, big 3 diy , ground wiring diy kit
BIG 3 DIY

With the kit made, onto the installation!

Big 3 DIY Installation

To make things less complicated, the wires will be named:

Wire 1:

15" Body (A) to Head (B)

Wire 2:

 22" Head (B) to Coil Pack (C)

Wire 3:

27" Coil Pack (C) to Battery Negative (D)

Wire 4 :

17" Battery Negative (D) to Body (E)


Big 3 Kit Installation Step 1:

Use the 10mm socket wrench to unbolt the nuts on your engines valve cover. Remove the valve cover completely.
Big 3 DIY

Big 3 Kit Installation Step 2:

We are ready for the installation of our Big 3 kit now.We will start from the left side of the engine.Simple unscrew the bolts on the bracket that holds the A/C line. Put one ring connector on Wire 1 through the bolt then screw it back in firmly.


Big 3 DIY

Big 3 Kit Installation Step 3:

The next step is to weave Wire 1 around enough to get to the bolt on the corner of the engine. Unscrew the corner bolt of the engine. Put the end of Wire 1 and the beginning of Wire 2 through the bolt. Screw the corner bolt back in.


Big 3 DIY
Big 3 DIY

Big 3 Kit Installation Step 4:

Weave Wire 2 through the wiring loom and s unscrew the last coil bolt putting the end of the Wire 2 and the beginning of Wire 3 together. Screw the coil bolt back on.

Big 3 DIY

Big 3 Kit Installation Step 5:

Weave Wire 3 again through the wiring loom and intake. Unscrew the negative terminal lead on the battery. NOTE:Try not to take the lead off completely as it may reset your cars ECU, clock, radio, etc. Put the end of Wire 3 and the start of Wire 4 onto the negative lead's bolt and screw it back on.

Big 3 DIY

Big 3 Kit Installation Step 6:

Unscrew the bolt on the throttle cable bracket located on the body. The end of Wire 4 should be placed as close as possible to the body. Put the bracket back on, then screw it in.
Big 3 DIY

Big 3 Kit Installation Step 7:

The installation is almost complete. Double-check all the bolts and make sure they are firmly screwed in.Also refrain from over-tightening.

Big 3 DIY

Big 3 Kit Installation Step 8:

Once you have doublle-checked all of the bolts, put the valve cover back on. Start the car, and pray it doesn't throw a "Check Engine" light. Just-kidding, as long as you follow these steps, you'll be fine.


Big 3 DIY
Big 3 DIY
Big 3 DIY

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