Duramax Diesels Forum Truck of the Week
  #1  
Old 03-24-2018, 03:30 PM
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Default LB7 Injector Harness Help

Putting my LB7 back together and just realized that I failed to mark the locations of the injector harness wires to the injectors like I usually do. Now I'm kicking myself in the rear and need some help understanding where they go. Are these +/- wires? I don't see any markings anywhere and I just flipped through my Haynes manual to try to find the electrical schematic and I don't see it. BTW Haynes says messing up the location is a big no bueno and that got me worried. Any help would be greatly appreciated!

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2004 LB7
EFI Live (Autocal) Idaho Rob Mild Tune
Edge CTS2 Gauge
Airdog ll-4G
4" Straight Exhaust
3" Downpipe
Bills Custom 4" Intake w/ S&B filter
Banks BigHead Wastegate
8" CST Lift
35" Toyo MT
Dual King 2.5 w/Remote Res Front/Rear
Deaver Leaf Springs
Cognito Long Travel Airbags
MagHytec Rear Diff
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Old 03-24-2018, 03:53 PM
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Post a pic of how you have it now. The harnesses only go on one way in theory.
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Best Time: 10.59 @ 128 (Kat Driving)

-"Betty" 2006 GMC LBZ CCSB
Best Time: 12.70 @ 104


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and a bunch of different things to come...
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Old 03-24-2018, 04:05 PM
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In theory yes I can see how they've formed over time but the clips on two harnesses have broken off. So the wires can go either way, 50/50 chance I short the injector out, the way I see it.

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2004 LB7
EFI Live (Autocal) Idaho Rob Mild Tune
Edge CTS2 Gauge
Airdog ll-4G
4" Straight Exhaust
3" Downpipe
Bills Custom 4" Intake w/ S&B filter
Banks BigHead Wastegate
8" CST Lift
35" Toyo MT
Dual King 2.5 w/Remote Res Front/Rear
Deaver Leaf Springs
Cognito Long Travel Airbags
MagHytec Rear Diff
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  #4  
Old 03-24-2018, 04:05 PM
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Red wires on #1 injector.

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2004 LB7
EFI Live (Autocal) Idaho Rob Mild Tune
Edge CTS2 Gauge
Airdog ll-4G
4" Straight Exhaust
3" Downpipe
Bills Custom 4" Intake w/ S&B filter
Banks BigHead Wastegate
8" CST Lift
35" Toyo MT
Dual King 2.5 w/Remote Res Front/Rear
Deaver Leaf Springs
Cognito Long Travel Airbags
MagHytec Rear Diff
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  #5  
Old 03-24-2018, 08:35 PM
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Are you asking about putting the wrong set of wires on the wrong injector or are you worried about having the wire swapped on the injector studs?
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285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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Old 03-24-2018, 10:06 PM
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On the injector studs.

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2004 LB7
EFI Live (Autocal) Idaho Rob Mild Tune
Edge CTS2 Gauge
Airdog ll-4G
4" Straight Exhaust
3" Downpipe
Bills Custom 4" Intake w/ S&B filter
Banks BigHead Wastegate
8" CST Lift
35" Toyo MT
Dual King 2.5 w/Remote Res Front/Rear
Deaver Leaf Springs
Cognito Long Travel Airbags
MagHytec Rear Diff
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  #7  
Old 03-24-2018, 10:55 PM
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Any will work. The injectors are not polarity sensitive. The solenoid is just a coil of wire. It doesn't care which way the current flows
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2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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Old 03-25-2018, 07:17 AM
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Correct, as long as each pair is on the correct injector.
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Old 03-25-2018, 08:20 AM
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Exactly what I was looking for, perfect explanation. Thanks guys! Freaking Haynes manual getting me all worked up

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2004 LB7
EFI Live (Autocal) Idaho Rob Mild Tune
Edge CTS2 Gauge
Airdog ll-4G
4" Straight Exhaust
3" Downpipe
Bills Custom 4" Intake w/ S&B filter
Banks BigHead Wastegate
8" CST Lift
35" Toyo MT
Dual King 2.5 w/Remote Res Front/Rear
Deaver Leaf Springs
Cognito Long Travel Airbags
MagHytec Rear Diff
Reply With Quote
  #10  
Old 03-25-2018, 08:48 AM
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No problem
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2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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  #11  
Old 03-25-2018, 02:24 PM
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That's what we are all here for.

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__________________
SOCAL DIESEL TRUCKS
WWW.SOCALDIESELTRUCKS.COM
MCFOO RACING
WWW.MCFOORACING.COM

-"Casper" 2005 GMC LBZ ECSB
Best Time: 10.59 @ 128 (Kat Driving)

-"Betty" 2006 GMC LBZ CCSB
Best Time: 12.70 @ 104


-"Bender" 1978 Chevy C30 4x4
454/TH400 Currently
Soon...Kodiak LBZ / Ally 2000 5 speed.
and a bunch of different things to come...
"My Glamis cruiser"

-"Mobile Marriott" 2006 Fleetwood Gearbox 300fs
McFoo Racing mobile command center

-"Spooky" 2002 Ford Explorer XLT/SE (Sucks Edition) Daily Driver. New Trans thanks to Mike L.


Thanks to all that helped me
- The McRats
- Mike L @ Inglewood Transmission
- And many others


Reply With Quote
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