WTB 68 under dash wiring harness . - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jose · 01-17-2005, 12:04 AM

The title says it all . Want to buy an unmolested/uncut 68 under dash wiring harness for automatic .

lamar · 01-17-2005, 12:10 AM

I might have one I'll check and let you know.

longhorn71 · 01-17-2005, 12:14 AM

just a quick note.there is two harnesses for these trucks.One with gauges and one with idiot lights.plus there is two different under hood harnesses too because of this.so make sure you get the right one.just thought i would let you know.

lamar · 01-17-2005, 12:17 AM

Hey longhorn71 what is a easy way to tell the difference? That way I said I'd have to check I have a few just have to take out to my truck to know the diff.

jose · 01-17-2005, 12:36 AM

Good call longhorn71 , I want the one for gauges .

longhorn71 · 01-17-2005, 01:27 AM

Quote:

Originally Posted by lamar

Hey longhorn71 what is a easy way to tell the difference? That way I said I'd have to check I have a few just have to take out to my truck to know the diff.

here is the wiring diagrams

Rod · 01-17-2005, 01:29 AM

Look at the plug that goes into the back of the gauge package. If the second space is blank its a full gauge..if a third space is blank its a idiot gauge. Thats a general quick look...you really have to know what your looking at overall...there are difference in plugs and wires between standard 4 speed tranny , 3 speed tranny and automatic tranny harnesses on the inside also.

The blank space is on different sides..but generally a 2nd space or 3rd space is a quick look guess between the 2 types.

Basically an auto has 2 purple wires to a plug for neutral safety switch.

3 speed has greens and yellow perhaps to reverse switch only.

4 speed has a wire to tranny.

Also 67 and 68 have harness fuse blocks that mounts sideways.

Takes a bit but I can grab and know what I have in hand.

lamar · 01-17-2005, 07:40 AM

Thanks that makes it much easier. jose I'll let you know this afternoon.

HOTFUN · 01-17-2005, 12:33 PM

Rod
I think you meant position 2 blank or position 4 instead of 2 or 3.
Another quick method is to check if the solid black ground wire to the top of the plug in has the blank slot on the same side of the plug or the opposite. If its the same side of plug you are an idiot light and opposite sides you are loaded with gages!
Mark

jose · 01-17-2005, 01:09 PM

Thanks Lamar let me what you come up with .
Thanks Rod and Mark it makes it more interesting . Now would i have to repalce both harnesses under my hood ? I am converting to automatic at present it has a floor shift 4 speed and gauges .

HOTFUN · 01-17-2005, 01:26 PM

If I remember correctly, from the GM parts book I am sure the starter harness is different between manual and the automatic but I believe the headlight charging circuit is the same. And if it has the electric type of auto kickdown used a turbo 400 type, it would have it's own single feed wire seperate from the harness. So the kickdown is not the issue.
Mark

jose · 01-18-2005, 05:49 PM

Still need the under dash wiring harness for 68 .

01-17-2005, 12:04 AM	#1
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	WTB 68 under dash wiring harness . The title says it all . Want to buy an unmolested/uncut 68 under dash wiring harness for automatic . __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

01-17-2005, 12:10 AM	#2
lamar Registered User Join Date: Apr 2004 Location: Covington,Ga Posts: 453	I might have one I'll check and let you know. __________________ 72 C-10

01-17-2005, 12:17 AM	#4
lamar Registered User Join Date: Apr 2004 Location: Covington,Ga Posts: 453	Hey longhorn71 what is a easy way to tell the difference? That way I said I'd have to check I have a few just have to take out to my truck to know the diff. __________________ 72 C-10

01-17-2005, 12:36 AM	#5
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	Good call longhorn71 , I want the one for gauges . __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

01-17-2005, 01:29 AM	#7
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Look at the plug that goes into the back of the gauge package. If the second space is blank its a full gauge..if a third space is blank its a idiot gauge. Thats a general quick look...you really have to know what your looking at overall...there are difference in plugs and wires between standard 4 speed tranny , 3 speed tranny and automatic tranny harnesses on the inside also. The blank space is on different sides..but generally a 2nd space or 3rd space is a quick look guess between the 2 types. Basically an auto has 2 purple wires to a plug for neutral safety switch. 3 speed has greens and yellow perhaps to reverse switch only. 4 speed has a wire to tranny. Also 67 and 68 have harness fuse blocks that mounts sideways. Takes a bit but I can grab and know what I have in hand. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-17-2005, 12:14 AM	#3
longhorn71 Senior Member Join Date: Sep 2004 Location: CANADA Posts: 1,681	just a quick note.there is two harnesses for these trucks.One with gauges and one with idiot lights.plus there is two different under hood harnesses too because of this.so make sure you get the right one.just thought i would let you know.

01-17-2005, 07:40 AM	#8
lamar Registered User Join Date: Apr 2004 Location: Covington,Ga Posts: 453	Thanks that makes it much easier. jose I'll let you know this afternoon. __________________ 72 C-10

01-17-2005, 12:33 PM	#9
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	Rod I think you meant position 2 blank or position 4 instead of 2 or 3. Another quick method is to check if the solid black ground wire to the top of the plug in has the blank slot on the same side of the plug or the opposite. If its the same side of plug you are an idiot light and opposite sides you are loaded with gages! Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

01-17-2005, 01:09 PM	#10
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	Thanks Lamar let me what you come up with . Thanks Rod and Mark it makes it more interesting . Now would i have to repalce both harnesses under my hood ? I am converting to automatic at present it has a floor shift 4 speed and gauges . __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

01-17-2005, 01:26 PM	#11
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	If I remember correctly, from the GM parts book I am sure the starter harness is different between manual and the automatic but I believe the headlight charging circuit is the same. And if it has the electric type of auto kickdown used a turbo 400 type, it would have it's own single feed wire seperate from the harness. So the kickdown is not the issue. Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

01-18-2005, 05:49 PM	#12
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	Still need the under dash wiring harness for 68 . __________________ 68 GMC 4x4 SWB jose6772@yahoo.com



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