Big 3 advice for a '10 sti?

Stupid48 · 02-09-2013, 06:28 PM

I poured through the audio forums but couldn't find details that were more specific to the '09 - '11 sti in terms of doing the big 3. I think this is something I can do myself but I was wondering if anyone had some pointers and/or pictures of the appropriate battery and grounding points on these models.

Firstly, I plan on running a 4ga power wire to my amps under my seats. I also plan on putting an inline fuse of 100amps at the battery. Looking at the existing wiring from the battery terminals, they are all bound up so before I tear them apart, I want to make sure I'm doing the right thing. Do I run a new 4ga wire from the alternator to the positive on the battery? It almost looks like the power wire going to the alternator now takes some other path before it gets there. How many grounds and where should I run them on my vehicle? If anyone has any advice and or pictures I would appreciate it...

Thanks, Chris

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teiva-boy · 02-09-2013, 10:49 PM

Nothing is special about your car. Find an install in ANY year Subaru and use that.

Stupid48 · 02-10-2013, 02:34 AM

Thanks. I was just making sure.

mulagain · 02-11-2013, 06:05 PM

I used a combo of these when doing my Big3 and grounding kit. Between them they worked well for my 2012:

http://forums.nasioc.com/forums/show....php?t=2341847

http://www.iwsti.com/forums/2-5-lite...installed.html

http://www.paranoidfabrications.com/...rezasti08.html

http://www.flex-innovations.com/wrx_instructions.htm

I grounded the 'engine' point on the tranny about half-way up the side in one of the hoist points but I was going for as much grounding as possible for 0ga wire. If you're running 4ga you could use one of the manifold hoist points (e.g. mystery bolts).

Still need to post my how-to (along with about 10 others I've procrastinated on)

02-09-2013, 06:28 PM	#1
Stupid48 Scooby Newbie Member#: 239447 Join Date: Feb 2010 Location: Las Vegas, NV Vehicle: 2010 WRX STI Spark Silver	Big 3 advice for a '10 sti? I poured through the audio forums but couldn't find details that were more specific to the '09 - '11 sti in terms of doing the big 3. I think this is something I can do myself but I was wondering if anyone had some pointers and/or pictures of the appropriate battery and grounding points on these models. Firstly, I plan on running a 4ga power wire to my amps under my seats. I also plan on putting an inline fuse of 100amps at the battery. Looking at the existing wiring from the battery terminals, they are all bound up so before I tear them apart, I want to make sure I'm doing the right thing. Do I run a new 4ga wire from the alternator to the positive on the battery? It almost looks like the power wire going to the alternator now takes some other path before it gets there. How many grounds and where should I run them on my vehicle? If anyone has any advice and or pictures I would appreciate it... Thanks, Chris * Registered users of the site do not see these ads.

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02-09-2013, 10:49 PM	#2
teiva-boy Scooby Guru Member#: 22825 Join Date: Aug 2002 Chapter/Region: NWIC Location: Seattle, WA	Nothing is special about your car. Find an install in ANY year Subaru and use that.

02-10-2013, 02:34 AM	#3
Stupid48 Scooby Newbie Member#: 239447 Join Date: Feb 2010 Location: Las Vegas, NV Vehicle: 2010 WRX STI Spark Silver	Thanks. I was just making sure.

02-11-2013, 06:05 PM	#4
mulagain Scooby Newbie Member#: 319912 Join Date: May 2012	I used a combo of these when doing my Big3 and grounding kit. Between them they worked well for my 2012: http://forums.nasioc.com/forums/show....php?t=2341847 http://www.iwsti.com/forums/2-5-lite...installed.html http://www.paranoidfabrications.com/...rezasti08.html http://www.flex-innovations.com/wrx_instructions.htm I grounded the 'engine' point on the tranny about half-way up the side in one of the hoist points but I was going for as much grounding as possible for 0ga wire. If you're running 4ga you could use one of the manifold hoist points (e.g. mystery bolts). Still need to post my how-to (along with about 10 others I've procrastinated on)