87 blazer with 89 motor and wiring harness - The 1947 - Present Chevrolet & GMC Truck Message Board Network

indyrenegade4x4 · 01-21-2010, 08:47 PM

The 89 wiring harness from a donor blazer will not screw into my 87 firewall harness under hood. Any idea on how I can make this work?

tvblazer78 · 01-21-2010, 08:55 PM

You got me on that one, Can anyone help him out?

kevinr1970 · 01-22-2010, 08:21 PM

I can't say this with certainty, but I think you will need to use the harness from your '87.
I believe the harness will control all the right things though.

indyrenegade4x4 · 01-26-2010, 08:46 PM

did chevy change the fuse
block(wire block) on the firewall from 1987 to 1989 models. The only thing i can think of is in 88 or 89 they added something to the outside wire block under hood.

kevinr1970 · 01-27-2010, 01:18 AM

I recently put a '89-91 clip on my '87 crewcab.
The block end of the harness is very different. I had to cut the block-end off and splice in the block-end of my '87 harness.

Why are you needing to swap the harness?
If you are in need of replacing your exising harness you can do a lot of cutting and splicing like I did or better yet, find another donor harness from a more similar year.

indyrenegade4x4 · 02-04-2010, 09:43 PM

i bought it and the guy got one out of 89 with computer etc and thought he could take harness off and screw 89 harness in. I hate to splice but with little time, solder and shrink tube it will work. It is going to be used for mainly offroad.

01-21-2010, 08:47 PM	#1
indyrenegade4x4 Registered User Join Date: Feb 2006 Location: sharpsville, indiana Posts: 122	87 blazer with 89 motor and wiring harness The 89 wiring harness from a donor blazer will not screw into my 87 firewall harness under hood. Any idea on how I can make this work?

01-21-2010, 08:55 PM	#2
tvblazer78 Low & Fast! Join Date: Jan 2007 Location: Knoxville, TN Posts: 3,110	Re: 87 blazer with 89 motor and wiring harness You got me on that one, Can anyone help him out? __________________ Southeastern Mini Truckin' Nationals April 27 and 28, 2012

01-22-2010, 08:21 PM	#3
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: 87 blazer with 89 motor and wiring harness I can't say this with certainty, but I think you will need to use the harness from your '87. I believe the harness will control all the right things though. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

01-26-2010, 08:46 PM	#4
indyrenegade4x4 Registered User Join Date: Feb 2006 Location: sharpsville, indiana Posts: 122	Re: 87 blazer with 89 motor and wiring harness did chevy change the fuse block(wire block) on the firewall from 1987 to 1989 models. The only thing i can think of is in 88 or 89 they added something to the outside wire block under hood.

01-27-2010, 01:18 AM	#5
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: 87 blazer with 89 motor and wiring harness I recently put a '89-91 clip on my '87 crewcab. The block end of the harness is very different. I had to cut the block-end off and splice in the block-end of my '87 harness. Why are you needing to swap the harness? If you are in need of replacing your exising harness you can do a lot of cutting and splicing like I did or better yet, find another donor harness from a more similar year. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

02-04-2010, 09:43 PM	#6
indyrenegade4x4 Registered User Join Date: Feb 2006 Location: sharpsville, indiana Posts: 122	Re: 87 blazer with 89 motor and wiring harness i bought it and the guy got one out of 89 with computer etc and thought he could take harness off and screw 89 harness in. I hate to splice but with little time, solder and shrink tube it will work. It is going to be used for mainly offroad.



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