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My turn...First Gen 3500 swap thread (wiring snafu..help?)
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beechwood297 Gender:Male
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Location: Hudsonville, Michigan

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1985 Cavalier RS Convertible

PostPosted: Sat Mar 31, 2012 3:18 pm    Post subject: Reply with quote

I have been sick lately, but managed to get most everything wired up. I actually was able to turn over the motor today, although just to say I could. I have to get the fuel pump going yet. But I will tell you it was sweet victory to hear her turn over.

Have a few issues to deal with differences as the wiring harness is from an '89, but I can see the light at the end of the tunnel.

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beechwood297 Gender:Male
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Location: Hudsonville, Michigan

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1985 Cavalier RS Convertible

PostPosted: Wed Apr 11, 2012 10:05 pm    Post subject: Reply with quote

posted in General forum about a wiring harness problem I am having. The 1990 harness is not matching the 1985 fuse block. If you have diagrams, please post there for me. I believe it is keeping the car from running as everything is installed
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cavalier3400z Gender:Male
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1989 Cavalier Z24
1991 Cavalier RS Coupe
2000 Cavalier Z24

PostPosted: Thu Apr 26, 2012 12:46 pm    Post subject: Reply with quote

Does the 90 have a fuse block under the dash? If so I can get you one for an 89 and a 90. 89 should be close if not the same as yours. Just need to know for the 90.
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beechwood297 Gender:Male
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1985 Cavalier RS Convertible

PostPosted: Sat Apr 28, 2012 5:32 pm    Post subject: Reply with quote

Car is back outside under a tarp. Have done little diagnosing yet. Even though erlier I had posted incorrectly, the current wiring harness is from a 1990. Not sure about how easy it would be to integrate a 1990 fuse block. I may just end up re-wiring so the fuel pump and what ever else isn't getting juice, does. It figures, too, as I have great disdain for intricate electrical problems.
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SuperDave Gender:Male
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1991 Cavalier Z24
2003 Avalanche 1500
1989 Camaro
1972 Nova

PostPosted: Sat Apr 28, 2012 10:14 pm    Post subject: Reply with quote

I'd just trace out what's not working and you should be able to hook it all up to the old fuse box. Just take your time.


When i wired my 91 Cavalier engine harness into the 89 Camaro body harness i had all kinds of the same problems. I'm an electronics engineer and it still gave me a headache.

Edit.. here you go...



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Fig. Fig. 19 2.8L (VIN W) Engine control wiring diagram&mdash1985 vehicles.gif
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beechwood297 Gender:Male
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1985 Cavalier RS Convertible

PostPosted: Sat May 05, 2012 8:05 pm    Post subject: Reply with quote

I think I have these already but still, thanks.

I am just schematic dumb.

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Last edited by beechwood297 on Wed May 09, 2012 12:11 pm; edited 1 time in total
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Six_Shooter Gender:Male
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1985 S15 Jimmy
1985 SkyHawk
1998 Malibu
1984 Other
1973 240z

PostPosted: Sun May 06, 2012 10:31 pm    Post subject: Reply with quote

Odd, I used a '91 harness (albeit from an L-body) to convert my 4cyl auto to 5-speed manual, and all but I think one of the wires matched up between them at the driver side bulkhead connector. I did have to swap out the 4 wires for the wiper motor, because the L-body's wiper motor was different.

I used the Haynes repair manual to look at pin position in that bulkhead connector and compare the harnesses.

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beechwood297 Gender:Male
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1985 Cavalier RS Convertible

PostPosted: Wed Jul 18, 2012 9:44 am    Post subject: Reply with quote

Here's an update: Been crazy hot here and with the car in direct sunlight, it has put a damper on my "enthusiasm" to work on her. Well, that and spending time up north on the lake

Confidence is high that it will be running soon which probably means in time for snow lol.



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87zbeater Gender:Male
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1987 Cavalier Z24

PostPosted: Tue Oct 16, 2012 7:59 am    Post subject: wiring Reply with quote

I spotted your swap a couple months ago, and have been waiting for admin to authorize my account so I could post a reply... just wondering, considering your swap, is your original 2.8 engine harness/ECM intact, and would you be willing to part with it?
I had an 86 Z that I was in process of restoring before the storage yard sold it on me, but I've been looking (with no success) for another 85/86 2.8 donor car that I could pull wiring from for my project... I built a 3.4/3400 hybrid motor for my 86, which has been sitting in my garage for several years, which I would like to use now in one of my Fieros (considering the rarity of 1st gen Z24's around here, I've all but given up on finding a replacement for mine, which was totally a sentimental value car anyway), but in order to use the motor, I either have to spent a fortune on full custom programming, or else track down a mass-air based ECM and Harness from an 85/86 J-body to run it... I could/would use the setup from my 87 Z24, due to the body being rusted/damaged beyond reasonable repair, but the 87 is DIS, and I need to keep my distributor to make the motor work the way I set it up...

Just hoping you might be able to help...

And that's a beautiful 1st gen Vert, BTW... I always wanted to build a 1st gen Z24 Vert, but never found a suitable body that I could afford...
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beechwood297 Gender:Male
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1985 Cavalier RS Convertible

PostPosted: Thu Oct 25, 2012 9:44 am    Post subject: Reply with quote

Sorry to all for the long delay in posting. Life has dealt me some serious blows as of late and the project has been just sitting.

And now I have had to make the unfortunate but necessary decision to sell her. She is just some wiring away from running. Such a shame as this car has been in the family since 1986 Sad

87Zbeater the harness for the 2.8 is not useable. I cut it. Sorry.

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beechwood297 Gender:Male
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1985 Cavalier RS Convertible

PostPosted: Tue Nov 20, 2012 10:14 am    Post subject: Reply with quote

Anyone interested in buying this project see the BUY/SELL/TRADE forum.
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beechwood297 Gender:Male
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1985 Cavalier RS Convertible

PostPosted: Thu May 23, 2013 12:37 pm    Post subject: Reply with quote

Since there was little interest when I tried to sell her, I am back on the wagon (so to speak) and gonna try to get her running.

Now to relearn all I have forgotten lmao

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sycklash Gender:Male
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1982 Firenza
1973 Nova
1989 240sx
1994 Cavalier Z24 Sedan

PostPosted: Thu May 23, 2013 1:18 pm    Post subject: Reply with quote

beechwood297 wrote:
Since there was little interest when I tried to sell her, I am back on the wagon (so to speak) and gonna try to get her running.

Now to relearn all I have forgotten lmao


Good to hear! You'll have fun once you get it running
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wadus Gender:Male
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1987 Cavalier Z24
1990 Mustang GT
1987 Cavalier Z24
1988 Bronco II

PostPosted: Thu May 23, 2013 2:21 pm    Post subject: Reply with quote

beechwood297 wrote:
Since there was little interest when I tried to sell her, I am back on the wagon (so to speak) and gonna try to get her running.

Now to relearn all I have forgotten lmao


Glad to see you are back at it. Hopefully everything will go smoothly.
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93cavalier Gender:Male
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1993 Cavalier VL Sedan
1988 Bonneville LE
1992 Sc400

PostPosted: Fri May 24, 2013 3:33 am    Post subject: Reply with quote

Hey joel if you need im still willing to lend a hand i wanna hear her run after all the trouble last year. i say we just ground everything and see where the problem was with the ecm. Your throttle bracket is done just going to sandblast it and coat it for you.
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