4 gage goes through the 1/2 inch plug on the driver's side firewall, which can be seen behind the brake booster from under the hood with a flashlight. I think you have to drill if you go with larger diameter wire.

 

My 0ga runs through right next to where the A/C drain tube is. I had to use a 1" hole saw and a water proof grommet.

 

This is my problem also I can't decide wether or not 4ga will be enough...Technicaly it is not big enough for my amps, but neither one runs at full power.

I'm supposed to have 1 4ga and 1 6ga but the 6ga amp is just for the front components. Maybe after I hit over 5000 miles I will feel less bad about drilling a 1 inch hole into my Babys firewall?

 

Go to www.bcae1.com and go into the section on wire, which is section no. 16 on the right hand list. There are some nice system design calculators there.

 

I'm supposed to have 1 4ga and 1 6ga but the 6ga amp is just for the front components. Maybe after I hit over 5000 miles I will feel less bad about drilling a 1 inch hole into my Babys firewall?

You'll never see the hole, and if you decide to sell the truck, a piece of aluminum flashing and some sound mat will easily cover it.

 

Sammy....you might have already done this but could you take some pics of the firewall hole (from the cab and the engine bay)? How did you get the drill in there? What side did you go through? Would it be easier to go through the inside of the cab if I removed the glovebox and drilled from there? I took a quick look and I just want to be sure I am drilling in the same place as others have already done. I want to do it right the first time.

 

Sammy....you might have already done this but could you take some pics of the firewall hole (from the cab and the engine bay)? How did you get the drill in there? What side did you go through? Would it be easier to go through the inside of the cab if I removed the glovebox and drilled from there? I took a quick look and I just want to be sure I am drilling in the same place as others have already done. I want to do it right the first time.

I'll try to get a picture today. I drilled from the cab forward, using a smaller bit for a pilot hole. I already had my glove box removed, so I can't really tell you if it's in the way or not. It would probably be impossible to go from the engine side, because there isn't much room to work in.

 

Hope this helps. Sorry I couldn't get much better of a picture, I already have my carpet reinstalled, so it was difficult to get back up in there.

 

wow how did you get that pic--lol

mine went through the lower tip of the N on the firewall I used a small carbide bit to pilot the hole then used a unibit with a 1" step to drill the hole

youll need at least a 18v drill or corder version with some power

 

wow how did you get that pic--lol

mine went through the lower tip of the N on the firewall I used a small carbide bit to pilot the hole then used a unibit with a 1" step to drill the hole

youll need at least a 18v drill or corder version with some power

Just pulled back the carpet and foam and snapped it, not hard. I never saw the "N" you guys were refering to. I just tried to take measurements based off of the A/C drain on both sides. I used a small bit to ensure it was properly aligned. My first hole came out too close to the drain on the engine side, the one that runs out towards the side of the truck. I covered that small hole with the bquiet you see there, then adjusted from there. I couldn't find a 1" unibit, so I had to use a hole saw. That sheet metal is pretty thin, so it wasn't too difficult, although I did bend my hole saw's center bit (cheap.)

 

yeah those 1" unibits are hard to find took me forever to find on --lol

I had to get it from sears