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Old 08-12-2018, 10:16 PM   #1
BeastianSTI
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Member#: 310506
Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
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2005 WRX STi
CGM

Default Accessory Fuse Box Wiring

Hey guys,

Adding some new gauges to my 05 STi and am going to be adding more down the line most likely. I ripped out my old prosport gauges and am installing Defis and want to do it right. I'm also installing a wide band which needs greater power than a typical gauge since the power line is used to heat the sensor.

I'm looking to install a custom fuse box in the cabin to enable to me install new gauges/further accessories down the road and wanted to run the setup past you guys.

Also curious where some of you may have mounted your fuse block inside the cabin.

Here's what i'm thinking, in order to supply constant 12v and switched 12v to my accessories:



What are your thoughts? Thanks!
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Last edited by BeastianSTI; 08-13-2018 at 12:53 AM.
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Old 08-13-2018, 12:43 AM   #2
mrsaturn7085
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I'd utilize a better bus-block that can deal with more than 1 input to keep things clean (switched and constant circuits in one block); ideally you'll have fuses and relays all in the block. Beyond that you've got a fairly top-level design you're showing us - might want to double-back when you're actually down in the weeds.

Unless you're wiring in some serious air horns or fog lamps, you don't need to do any of this. If you want to install an isolator or kill switch, that would be a good time to jump into something a little more in-depth like this.
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Old 08-13-2018, 12:59 AM   #3
BeastianSTI
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Join Date: Feb 2012
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Location: Florida
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2005 WRX STi
CGM

Default

Quote:
Originally Posted by mrsaturn7085 View Post
I'd utilize a better bus-block that can deal with more than 1 input to keep things clean (switched and constant circuits in one block); ideally you'll have fuses and relays all in the block. Beyond that you've got a fairly top-level design you're showing us - might want to double-back when you're actually down in the weeds.

Unless you're wiring in some serious air horns or fog lamps, you don't need to do any of this. If you want to install an isolator or kill switch, that would be a good time to jump into something a little more in-depth like this.
If I'm understanding the Innovate LC-1 documentation (#1) correctly, they want a dedicated power line for their stuff. Instead of just running a wire through the firewall for that, I figured just setting up a block and wiring the other gauges up to it might be cleaner. Last time around, I had a bunch of gauge wires merged together and in hindsight that wasn't great practice.

The Defi gauges also mention they want dedicated power lines as well.

#1 from Innovate:

Code:
Circuits that share power with the vehicle's stereo, ignition system, ECU, lighting, or fuel
pump should not be used. When in doubt, create an additional circuit using an automotive relay
available at any automotive parts supplier. See the next section for a relay installation diagram.
#2 from Defi:

Code:
When several gauges are installed into a vehicle, use each power supply wire to connect gauges to
the vehicle independently. Do not join multiple power supply wires. Do not share single fuse with
multiple gauges. Every gauge requires independent fuse for IGN and +B line
Is there a simpler way you could see wiring this while still adhering to both Defi and Innovate's recommendations? I like the idea of a more comprehensive bus block. Guess i'll need to do some research to see what's out there.

Thanks!
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Old 08-13-2018, 02:34 AM   #4
BeastianSTI
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2005 WRX STi
CGM

Default

OK - I think I've come up with something that's a bit simpler. It'll just use a relay to power the wideband. The other gauges, since they don't draw much would just pull switched 12v from one of the fuses in the cabin. I'm thinking the stereo fuse.



How does this look?
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Old 08-13-2018, 03:16 AM   #5
mrsaturn7085
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2006 Impreza WRX STI
WR Blue

Default

The only thing that needs a dedicated power wire is the O2 heater - all the other stuff is low current.
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