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Old 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

Default 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
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Old 02-09-2013, 10:49 PM   #2
teiva-boy
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Member#: 22825
Join Date: Aug 2002
Chapter/Region: NWIC
Location: Seattle, WA
Default

Nothing is special about your car. Find an install in ANY year Subaru and use that.
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Old 02-10-2013, 02:34 AM   #3
Stupid48
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Member#: 239447
Join Date: Feb 2010
Location: Las Vegas, NV
Vehicle:
2010 WRX STI
Spark Silver

Default

Thanks. I was just making sure.
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Old 02-11-2013, 06:05 PM   #4
mulagain
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Member#: 319912
Join Date: May 2012
Default

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)
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