Jump to content
Notice to Hotmail/Gmail & BT Internet users - Please check your SPAM/JUNK folders for our emails. Please add our email as a contact to your email account.
Sign in to follow this  
Foxie

The Big Three (TB3)

Recommended Posts

Foxie

Upgrading The Big Three (TB3)

This involves replacing the standard, OEM wires in the vehicle's electrical system with larger, more capable wires.

The three wires involved are:

Alternator > Battery Positive *

Chassis > Battery Negative

Engine Block > Battery Negative

* This wire must be fused at both ends, within 6" (ideally) of the battery and the alternator. The fuse should be the same amperage rating as your alternator.

These are usually shabby, thin wires that aren't that much use in carrying the large amount of current needed when the ICE is added into a car.

Often the OEM wires are less than 8AWG in size, and this soon becomes the weakest link in the electrical system.

If your lights are dimming with the bass, it is far better to upgrade TB3 than to purchase a capacitor in the first instance.

There are usually two options when upgrading TB3 - you can either replace the existing wires, or run additional wires next to them. Make sure that any additional wires are fastened with cable ties, and make sure that the alternator wire is fused at both the battery end and the alternator end. The fuse should be the same rating as the alternator's output rating (can be anything between 50A and 120A). Make sure all connections are clean - sand the paint back down to bare metal and remember to add vaseline/grease to prevent oxidation.

Share this post


Link to post
Share on other sites
Lyons

do you think its neccecary in a mk6? because the wires to earth and to the altenator are massive!! bigger than 4awg by quite alot, dno what they are. never notice my lgihts fading either, i have a 750watt rf amp. will i notice any difference?

Share this post


Link to post
Share on other sites
Foxie

sounds to me like the stock stuff is more than adequate :)

Share this post


Link to post
Share on other sites
Lyons

good news, cheers. also, i have 8awg street wires power wire, is this ok for my amp? becuase there was a misunderstanding at the shop when i bought them and they thought my amp was half the power it is!!

Share this post


Link to post
Share on other sites
Guest wrighty
good news, cheers. also, i have 8awg street wires power wire, is this ok for my amp? becuase there was a misunderstanding at the shop when i bought them and they thought my amp was half the power it is!!

that would depend on the current draw of the amp(s).

Share this post


Link to post
Share on other sites
Foxie

look at the fuse(s) on the amp itself and add them together whats the number ??

Share this post


Link to post
Share on other sites
Lyons

doesnt have any fuses on the outside of the amp, only internally i think, i just got a 60amp fuse on the live power wire from the battery. its a rf punch 600a.....if that helps?

Share this post


Link to post
Share on other sites
Guest WildChild

I have an MK1 Polo with 2 x 6x9 150W RMS in parcel shelf, 2 x 6.5" 180W SPL Dynamics in front doors and a Sony CDX-C5000R 50Wx4 Headunit, i've just fitted this headunit and got rid of a 15 year old Pioneer CD Player 4x30W due to not having skip protection and also the lights seemed to fade in the car when using it..

now i've read this thread i've just installed my new headunit today and the same thing is happening, the interior lights &/or headunit display is fading in and out slightly.. and when i put the volume over a certain amount it starts to skip cd's or miss parts of the track.... did this with both headunits

I presume from reading this, that it is because of these wires, how easy and costly would it be to replace these wires?

I'm running a Heavy Duty BMW 3 Series Bosche Battery inreplacement for my previous original 200mAh battery..

Share this post


Link to post
Share on other sites
Guest mk3phill

will be gettin my polo in a few days but wont be drivin so need something to play with,....what would the best size wire to go for on a mk3,..will be running new hunit,front compo's and sub/amp.???

Share this post


Link to post
Share on other sites
Holokid87
will be gettin my polo in a few days but wont be drivin so need something to play with,....what would the best size wire to go for on a mk3,..will be running new hunit,front compo's and sub/amp.???

any pics of who has done this?

Share this post


Link to post
Share on other sites
Guest Kish and chips

Why is there two fuses running between the battery and alternator when there are no components in between? would once fuse be sufficient? Or is there a logical reason for this?

Share this post


Link to post
Share on other sites
Andy

It's also worth noting, that in some applications at least the manufacturer carefully choses those cable ratings to limit the currents from battery/alternator.

I'm not saying it's wrong to beef up the cable, but just understand what you're doing - and think it through. Make sure the battery and alternator are up to the job too.

Share this post


Link to post
Share on other sites
Guest vwmk3jon
I have an MK1 Polo with 2 x 6x9 150W RMS in parcel shelf, 2 x 6.5" 180W SPL Dynamics in front doors and a Sony CDX-C5000R 50Wx4 Headunit, i've just fitted this headunit and got rid of a 15 year old Pioneer CD Player 4x30W due to not having skip protection and also the lights seemed to fade in the car when using it..

now i've read this thread i've just installed my new headunit today and the same thing is happening, the interior lights &/or headunit display is fading in and out slightly.. and when i put the volume over a certain amount it starts to skip cd's or miss parts of the track.... did this with both headunits

I presume from reading this, that it is because of these wires, how easy and costly would it be to replace these wires?

I'm running a Heavy Duty BMW 3 Series Bosche Battery inreplacement for my previous original 200mAh battery..

Wheres the power for the headunit coming from? Standard cables? These sometimes are no-where near upto the job (like mine) so i upgraded the power supply to the h/u and it seemed to help abit.

Here is a more in-depth look at it:

http://forum.sounddomain.com/ubb/ultimateb...=5;t=007801;p=1

I'm gonna do this soon as my lights dip with the bass hehe

At least your lights dip! Mine nearly go off!

Share this post


Link to post
Share on other sites
xb0vv

i dont understand, my friend runs a 1500w sub, 6x9's, headunit with a screen, all on his 1.0 6n and he has no problems.

shall i warn him lol?

Share this post


Link to post
Share on other sites
Foxie

its obviously not 1500 'real' watts then ;)

Share this post


Link to post
Share on other sites
koolspot

has anyone done this then?

any pics?

need to get mine done asap boy !!

hopefully if i dont get too high this weekend il go and buy my kit..... :shock:

il def put pics up once i get mine done :thumbsup:

Share this post


Link to post
Share on other sites
ProXx23

Common guys take some pictures of the big 3 pls. :-( I want to se how it looks! :cry:

Share this post


Link to post
Share on other sites
Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Terms of Use Privacy Policy Guidelines