4l80e wiring question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CamaroChris · 08-08-2011, 03:24 AM

I need help, harness and trans are from a 2000 yukon XL 2500 on the trans there is a neutral safety switch, on this "NSS" There are Two connectors. (which are ****ing GLUED in) why do they glue them? 3 harnesses I have done up were all glued! Anyway, the bottom connector has Four wires. BLK/WHT, WHT, YEL, GRY. These wires are from the neutral park switch to the PCM. the top connector has ~6 wires 2 PINK 1 PPL/WHT 2 LHT GRN 1 BLK WHERE DO THESE GO? These wires don't go to the PCM they went into the cab. I have searched tech with no luck. one should be a TCC to brake pedal? or does the TCC come from pin 33 brake switch on the blue connector?

BR3W CITY · 08-08-2011, 01:18 PM

I had a custom harness made for mine, so I'm not sure which wire is which; but I can tell you that my harness eliminated a handful of the wires that went to the cab. Those were for the PRNDL indicator on the dash.

Ackattack · 08-08-2011, 03:38 PM

kinda hard to say without a wiring diagram in front of me, but what about the transfer case? I'm wondering if they went to the push button controller thing. Just an idea.

I also had a big funky connector that I believe went the the ABS module down near the tranny.

CamaroChris · 08-08-2011, 08:04 PM

The transfer case wiring was deleted already. I'm thinking it's reverse lights, gear selector stiff like that. I think of will delete them but I need to find what they are for first.
Posted via Mobile Device

tonypaul · 08-09-2011, 01:15 AM

I have a 4l80e on my 7.4l Vortec in my 1968 gmc. I just pulled off the whole plastic switch off the transmission and got a kit from Lokar that attaches to the trans. It has a switch with this fork like part that will activate my reverse lights and my neurtral safety from the rod on my column shifter. Works great!

This what I got-
http://www.streetperformance.com/par...3-bl1400u.html

Robznob11 · 08-18-2011, 10:18 PM

you don't need the nutral safety switch. if you are running an aftermarket shifter it should have a micro switch for back up lights. if you have somehow reworked the linkage to use the colum shift then use that switch also The main plug you need for the tranny is the round one and I think maby two little black ones but it has been awhile since I looked I know for a fact that i took the switch off the side of the tranny and chuncked it though. I run a b&m pro ratchet 4l80e

Super73 · 08-22-2011, 12:45 AM

See if this is helpful..

http://www.performancetrucks.net/for...t-swap-486918/

08-08-2011, 03:24 AM	#1
CamaroChris Registered User Join Date: Mar 2011 Location: Midvale, Utah Posts: 220	4l80e wiring question. I need help, harness and trans are from a 2000 yukon XL 2500 on the trans there is a neutral safety switch, on this "NSS" There are Two connectors. (which are **ing GLUED in) why do they glue them? 3 harnesses I have done up were all glued! Anyway, the bottom connector has Four wires. BLK/WHT, WHT, YEL, GRY. These wires are from the neutral park switch to the PCM. the top connector has ~6 wires 2 PINK 1 PPL/WHT 2 LHT GRN 1 BLK WHERE DO THESE GO? These wires don't go to the PCM they went into the cab. I have searched tech with no luck. one should be a TCC to brake pedal? or does the TCC come from pin 33 brake switch on the blue connector? __________________ I LIKE TRUCKS** 1986 GMC Suburban Build Build link 1982 Chevy SWB 2wd Scottsdale, Build Link Sold 1987 Jimmy Build, Project Cheap A$$ Build Link

08-08-2011, 01:18 PM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: 4l80e wiring question. I had a custom harness made for mine, so I'm not sure which wire is which; but I can tell you that my harness eliminated a handful of the wires that went to the cab. Those were for the PRNDL indicator on the dash. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

08-08-2011, 03:38 PM	#3
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	Re: 4l80e wiring question. kinda hard to say without a wiring diagram in front of me, but what about the transfer case? I'm wondering if they went to the push button controller thing. Just an idea. I also had a big funky connector that I believe went the the ABS module down near the tranny. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

08-08-2011, 08:04 PM	#4
CamaroChris Registered User Join Date: Mar 2011 Location: Midvale, Utah Posts: 220	Re: 4l80e wiring question. The transfer case wiring was deleted already. I'm thinking it's reverse lights, gear selector stiff like that. I think of will delete them but I need to find what they are for first. Posted via Mobile Device __________________ I LIKE TRUCKS 1986 GMC Suburban Build Build link 1982 Chevy SWB 2wd Scottsdale, Build Link Sold 1987 Jimmy Build, Project Cheap A$$ Build Link

08-09-2011, 01:15 AM	#5
tonypaul Registered User Join Date: Nov 2009 Location: Austin Tx Posts: 639	Re: 4l80e wiring question. I have a 4l80e on my 7.4l Vortec in my 1968 gmc. I just pulled off the whole plastic switch off the transmission and got a kit from Lokar that attaches to the trans. It has a switch with this fork like part that will activate my reverse lights and my neurtral safety from the rod on my column shifter. Works great! This what I got- http://www.streetperformance.com/par...3-bl1400u.html

08-18-2011, 10:18 PM	#6
Robznob11 Registered User Join Date: Feb 2004 Location: brownfield texas (west texas) Posts: 1,936	Re: 4l80e wiring question. you don't need the nutral safety switch. if you are running an aftermarket shifter it should have a micro switch for back up lights. if you have somehow reworked the linkage to use the colum shift then use that switch also The main plug you need for the tranny is the round one and I think maby two little black ones but it has been awhile since I looked I know for a fact that i took the switch off the side of the tranny and chuncked it though. I run a b&m pro ratchet 4l80e __________________ The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS

08-22-2011, 12:45 AM	#7
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: 4l80e wiring question. See if this is helpful.. http://www.performancetrucks.net/for...t-swap-486918/ __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

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