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Discussion Starter · #1 ·
Did Big 3 on my 2018 Silverado yesterday. Used GP 1/0 awg wire Big 3 Kit, took some pictures and also have some with the GP wire compared to Voodoo 1/0 as well. Voodoo is more flexible while the GP seems heavier duty, could be it also has an inner white plastic jacket, also doesnt seem to fray off like the Voodoo kinda easily did.

Anyways I got 2/3 done, Alternator power and battery ground to chassis. It was getting dark but I couldn't find the engine block to chassis ground, does anyone know where on a 2018 Silverado 1500 this would be? I did notice there are 2 ground wires connected to the negative battery terminal. 1 being the battery to chassis ground which looked to be about 10 awg and another bigger wire, maybe 6 awg? Looked bigger than 8 awg but smaller than 4. They ran together until they went in different directions, battery ground went down & under truck to ground right under passenger side where the other wire stayed in the engine bay, close to the firewall and about middle of bay, almost looked like it went to the engine block. Could this be the engine block ground? I always thought it was too grounded to the chassis though? Anyone with any knowledge I'd greatly appreciate it so I can finish my upgrade.

However just doing 2/3 I've seen an increase in voltage. I've been around 12.6-12.9 lately with everything running and since I did the 2 yesterday I'm now seeing between 14.4-14.9, I hope it's a permanent increase...

Heres the pics... GP is the darker black and the 1 with the inner white plastic.

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It doesn't really matter where the factory engine to chassis ground is, just add another one wherever you want. I have 4, 3 4 gauge and 1 1/0.
 

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that gp looks like welding cable


Welding cable is probably one of the best kinds of wire to use given its OFC and has a tough sheath (which most do). For example at work I regularly use 1/0 at about 250-300 amps at 30 volts on 100ft leads never gets hot. It can handle a measly 30-100 amps at 12v just fine in a car. Not mention it's wayyyyy cheaper than most "high quality audio" stuff


Sent from my iPhone using Tapatalk
 

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Did Big 3 on my 2018 Silverado yesterday. Used GP 1/0 awg wire Big 3 Kit, took some pictures and also have some with the GP wire compared to Voodoo 1/0 as well. Voodoo is more flexible while the GP seems heavier duty, could be it also has an inner white plastic jacket, also doesnt seem to fray off like the Voodoo kinda easily did.

Anyways I got 2/3 done, Alternator power and battery ground to chassis. It was getting dark but I couldn't find the engine block to chassis ground, does anyone know where on a 2018 Silverado 1500 this would be? I did notice there are 2 ground wires connected to the negative battery terminal. 1 being the battery to chassis ground which looked to be about 10 awg and another bigger wire, maybe 6 awg? Looked bigger than 8 awg but smaller than 4. They ran together until they went in different directions, battery ground went down & under truck to ground right under passenger side where the other wire stayed in the engine bay, close to the firewall and about middle of bay, almost looked like it went to the engine block. Could this be the engine block ground? I always thought it was too grounded to the chassis though? Anyone with any knowledge I'd greatly appreciate it so I can finish my upgrade.

However just doing 2/3 I've seen an increase in voltage. I've been around 12.6-12.9 lately with everything running and since I did the 2 yesterday I'm now seeing between 14.4-14.9, I hope it's a permanent increase...

Heres the pics... GP is the darker black and the 1 with the inner white plastic.

View attachment 231457 View attachment 231455 View attachment 231459 View attachment 231461 View attachment 231463 View attachment 231465 View attachment 231467
Is there a way for you to send me pictures where the battery to engine ground is ? If I’m following it right it looks like it’s buried in the block and impossible to get the bolt out
 

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This thread is about three years old, however you can ground to almost any bolt on the engine block.
 

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Discussion Starter · #8 ·
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Is there a way for you to send me pictures where the battery to engine ground is ? If I’m following it right it looks like it’s buried in the block and impossible to get the bolt out
It's raining outside so I cant get you a picture right now. I'm not sure if you want to know where the main battery is grounded too or where did I ground my engine block?

So I'll answer both... the battery is grounded underneath the chassis actually. If you go under the truck from the passenger side you'll see a black wire (Battery ground) grounded to a bolt, I'd say its underneath the footwell area of passenger. As for the engine block, you can just use 1 of the bolts on the engine (theres quite a few) and I ran mine to where another ground is, the woven looking silver wire, on my 2018 is just right of center, top of the firewall.

But you dont have to use the same grounding locations as I did, as was stated above you can ground anywhere as long as it's a groundable location with minimal resistance...

And just FYI I'm going to be redoing my Big 3, I'm gonna be using my 2/0 welding cable. I also will be dealing with the PCM sensor 1 way or another this time. I've seen an interesting set of instructions from Mechman or XS Power I believe about how to do the "Big 3" in GM trucks, because of the regulator they claim doin the normal big 3 doesnt work.

Instead they say you should just do Big 2. Power from Battery to Alternator just like Big 3, but heres where it gets different. They say run Ground from Battery, thru the PCM sensor & connect to the Alternator. That's it, they say dont ground the engine block and also to remove the factory battery ground, that these 2 connections are all that's needed... I'm going to try to include the picture so it gives a visual.


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