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02-18-2012, 06:44 AM
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#1 |
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Always a work in progress
Join Date: Jun 2007
Location: Harker Heights, TX
Posts: 1,599
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Stock harness to stand alone rebuild
I am at the point in my harness rebuild where I need to wire all the external "stand-alone" parts of the harness. As most of you know I need to supply keyed 12v to 8 injectors, 2 coil banks, 2 O2 sensors, MAF, and 2 PCM connections. I have a 4 fuse block that will have 1 constant 12v and 3 keyed 12v fuses. I was thinking of running 1 fuse for the 8 injectors, 1 fuse with the MAF, O2 and Coils and then the last fuse for the 2 PCM feeds. Does that sound like a good plan or should I get another 4 fuse fuse block and break it down even more?
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USMC Retired Never trust a man who can't laugh at his own fart! 2010 Silverado Crew Cab 73 SWB 5.3/4l80e Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=695168 |
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02-18-2012, 02:47 PM
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#2 |
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Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,118
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Re: Stock harness to stand alone rebuild
Alot of aftermarket harness companies bundle multiple like items together, but GM splits them up. Bundled together is easier and maybe a little cleaner looking, but on an original harness, if you blow one side of the engines injectors fuse, the engine will still limp by on the other side.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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02-18-2012, 04:46 PM
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#3 |
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Has more rust than truck...
Join Date: Apr 2005
Location: Ivanhoe, MN
Posts: 2,421
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Re: Stock harness to stand alone rebuild
My notes in their full ugly glory. I kept all the factory fuses to make trouble shooting easier.
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05-26-2012, 11:51 AM
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#4 |
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Registered User
Join Date: Sep 2011
Location: Nevada City, CA
Posts: 908
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Re: Stock harness to stand alone rebuild
I think using the factory fuse layout will make it easier to trouble shoot later on. I haven't gotten my hands on one of these harnesses yet, so I'm futon-quarterbacking you here. IMO, though, the more closely your final product mirror's a factory wiring diagram, the easier life is going to be later on and the more reliable your EFI is likely to be.
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05-26-2012, 01:01 PM
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#5 |
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A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,921
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Re: Stock harness to stand alone rebuild
Listen to these guys. Do NOT set up your fuses like lt1swap.com. Use the factory layout and you'll be better off for the reasons mentioned above...
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-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
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05-26-2012, 01:47 PM
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#6 |
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Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: Stock harness to stand alone rebuild
my stand alone harness only has one main power feed (orange) and one switched (pink) feed. The red you see is the fuel pump lead and its relay. System has 2 grounds (1 main), 2 relays (one is fuel pumps), one 4 circuit fuse panel.
By hooking the orange to battery, and the pink to 12v switched, plus securing grounds... my harness is powered up. 
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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05-26-2012, 09:33 PM
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#7 |
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Always a work in progress
Join Date: Jun 2007
Location: Harker Heights, TX
Posts: 1,599
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Re: Stock harness to stand alone rebuild
I went this way:
Even injectors odd injectors even coils odd coils maf/o2 sensors fuel pump fans
__________________
USMC Retired Never trust a man who can't laugh at his own fart! 2010 Silverado Crew Cab 73 SWB 5.3/4l80e Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=695168 |
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