How To: Big 3 Wiring Upgrade on a Classic Car

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Classic Cars often have underpowered electrical systems. In this video, Nick discusses what a Big 3 Wiring Upgrade is, and shows step by step instructions on how to perform this simple upgrade on your classic car.
The Big 3 (or Big 4) wiring upgrade can be done on any type of automobile, new or old. Classic cars, hot rods, restomods, and race cars can benefit greatly from this update to deliver a consistent and reliable electrical connection, ensuring headlights remain bright at low RPM, custom stereos have enough juice to power amps, and much more.
Got a question about your electrical system? Drop us a comment below!
#restomod #classicnation #wiring

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Опубликовано:

11 июл 2024

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Комментарии : 44

@markc521 Год назад

Literally cannot thank you enough for how simple and detailed this was.

@ClassicNation Год назад

You bet!

@jamesmarze9850 6 месяцев назад

thanks for showing a video on a classic car big 3 upgrade. I have a 1972 plymouth satelitte and i was concerned that the alternator wire would be effected considering the old school engineering which was very good back in the day. Makes sense to add another ground to the alternator thats genius. i hope that this will make everything smooth again thanks again.

@MS-fk5cy Год назад

Just a quick tip that I think improves on the large electrical connections. I have always used the thin copper foil that you can source from any welding supply house. These are used on welding lead connections. You take the copper foil and wrap around the bare wire before inserting into your crimp connection. This also makes it easier to insert the wire into the connector because you are not fighting any small wires that might be sticking out. This makes a really good tight connection when the connector is crimped on the heavy gauge wire.

@2460speedy Год назад

Great video. Finished result is excellent

@ChaseTheHonda 2 года назад

Very well mad video, thank you for the tips. Doing this on my 1949 Oldsmobile.

@DrCh0ngo 2 года назад

Great video and super useful for a newbie.

@NWGarage 2 года назад

Great video !

@alwyzDTF Год назад

Impressive and very clean...so simple. Thank you for sharing this knowledge!

@chevybrat Год назад

Awesome presentation, thanks for sharing!

@ClassicNation Год назад

Thanks for watching!

@noampitlik2332 4 месяца назад

We used to ask for 'police special' alternators back before more powerful units were made for anyone. Worked fine on stock wiring harnesses. Seems funny now. That 1/0 cable is normal. Make sure to install tinned copper lugs.

@lilmancc35 Год назад

Cant wait to do this to my 86 k10 and my 77 camaro.

@Alex-yi4ou 2 года назад

Just subscribe! I need links, that way you get credit lol awesome video

@robertwilson4400 6 месяцев назад

Great video I was wondering if you needed to also upgrade the starter wire as well?

@dougm2617 2 года назад

Hey Nick! Totally unrelated, did you ever post the other vids of your TKX install? I’d love to know what size driveshaft you used

@2mustange 2 года назад

Almost did the Big 3/4 on my Jeep. I had this plan to use a marine inline fuse inverter so i would never have to worry about fuses breaking. Never go around to it though. On my 66 mustang this might be a nice upgrade especially since i plan on doing the electronic power steering conversion.

@tittyrino Год назад

Just buy Audio battery connectors because they have lugs to run the 0 gauge right into.Nice and clean.Amazon sells a pair for $25 or less and even more hookups for a little more $.

@KGisthename 2 года назад

"it doesn't belong on a classic car" 😊 that engine is era appropriate though. Just kidding it looks good. I left my oxigen free copper 0 guages all running on the passenger inner fender parallel to each other with distribution blocks, but i have to feed a second battery and 2 huge amps my chevelle is a custom restomod though, I do get what you are going for however. Good meticulous work man.

@kenf2662 Год назад

Nice Video, In 100% of cars there is no fuse from the battery to the starter so why the alternator and what end would the fuse be, if the fuse is at battery you fried alternator if its at the alternator you started a fire or cooked your battery. I think with a big enough cable and good connection with the shield loom that your using . 'Should have no problem"

@nursecuenca 2 года назад

Great video. What size fuse do you use for 4g wire?

@ClassicNation 2 года назад

Thanks! 150 amps is sufficient to protect a 4g wire but I try to stick to125 amp or less!

@wesleyhowell5727 Год назад

How much red/black wire did you use? I want to do my 72 c-20

@dehaze7411 2 года назад

Question. I have 72 matador an it recently started to die after starting it. Like the battery completely dies an won't crank. Everything is new. What should I look for?

@rollingthunder1751 2 года назад

Like the fuse protection. Would fusing both ends of the alternator wire be a good idea to protect the entire run?

@tittyrino Год назад

Only one fuse less than 18 inches away from the battery.150 AMP fuse minimum.

@rollingthunder1751 Год назад

@@tittyrino Thanks for the reply. I thought the same, but after further thought, if the wire shorted the fuse would blow and cut power from the battery. However, power would still be coming from the alternator and the length of the wire to where it grounded or to the battery side fuse would still be hot.

@nextgenrawestboi3371 Год назад

What size fuse did u use how many amp fuse

@borg386 2 года назад

Anyone know a ballpark figure to pay a shop to do this? 68 cougar.

@candyassyes5838 2 года назад

What happened to the 67 mustang🥺

@ClassicNation 2 года назад

Still working on it! Hoping to have a video update soon!

@chevybrat Год назад

Where did you purchase the 0 wires, lugs, crimping tool etc.?

@ClassicNation Год назад

Ebay

@mostlypeacefulmisterputin 2 года назад

Just run the negative battery cable straight to the back of the alternator case

@ClassicNation 2 года назад

Yep, you could do that, if your alternator has a ground post on the back. Some do, some don't. Mine doesn't, otherwise thats exactly where I would have landed it. Thanks!