Wirng from ECM 89' S10 2WD

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Wirng from ECM 89' S10 2WD

Postby mixman98 » Wed Apr 19, 2017 10:42 am

Hey there guys. I want to clean up some of the wiring that will not be used when I install my non-ecm 350. I have the ECM unhooked from under the dash and see that DRAC is wired separate. My question is, can I just cut all of the wires that were going to the ECM and leave all of the others that run from the fuse block and upwards from the T? I do notice that there is a plug that comes out of the cluster where the main ecm wires are that runs up under the dash somewhere. Do I need to keep this intact?
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Re: Wirng from ECM 89' S10 2WD

Postby mixman98 » Thu Apr 20, 2017 6:32 am

Come on guys. I know someone out there has cleaned up their engine bay of all the wiring that is no longer used. I don't want to start cutting and cut the wrong wires.
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Re: Wirng from ECM 89' S10 2WD

Postby lowblazin94 » Thu Apr 20, 2017 8:07 am

Are you going to be running a carb? Are you wanting to use the stock gauges?

Do you have access to the wiring diagrams? Make sure you seperate the 12v power and then start seperating the unused wires like fuel injection and emissions etc before you start cutting
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Re: Wirng from ECM 89' S10 2WD

Postby mixman98 » Thu Apr 20, 2017 8:14 am

I am using a carb and will use the factory gauges for now, but will eventually install some aftermarket mechanical gauges.
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Re: Wirng from ECM 89' S10 2WD

Postby emilbus4390116 » Wed Apr 26, 2017 6:55 pm

What transmission will you be using?

I just did a very similar swap with my '89: carb'd 350, T5, factory speedo. I believe the ECM is still in the truck just as a mounting place for the DRAC but I'll check tomorrow. It's been parked away all winter. I'm curious, where are you located?
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Re: Wirng from ECM 89' S10 2WD

Postby mixman98 » Tue Jun 13, 2017 7:43 am

I'm gonna be using the 4L60E that was in the 4.3. I live in New Castle Delaware
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Re: Wirng from ECM 89' S10 2WD

Postby emilbus4390116 » Wed Jun 14, 2017 7:36 pm

OK, sorry for my delayed reply. I just got the speedometer working & calibrated last night!

Just to review, here's my setup:
1989 2wd S-10 (was 2.5L, 5 spd truck)
- carb'd 1st gen. 350 SBC
- T-5 w/c trans from Camaro
- Stock speedometer

From Dakota Digital, I'm using:
- DAK SEN-01-1: this mounts on the trans. & converts the mechanical speed signal to electronic which is needed b/c the stock speedo requires an electronic signal
- DAK SGI-5E: this is the interface used to calibrate the speedometer. If I ever change the transmission, gear ratio, or tire height I can simply change my calibration setting in this unit for speedometer accuracy. The SEN-01-1 from above is wired into this unit.

The ECM & DRAC are no longer necessary. They're in the truck but not connected to anything. I pulled the blue/black signal wire (#824) from the DRAC and terminated it at the SGI-5E output signal. This is the wire that communicates to the speedometer.

In short, you can remove the ECM wiring but if you're using the stock trans, rear end, and tire height I assume you'll want to keep the DRAC so your speedometer works properly. If you were ambitious, you could implement just the SGI-5E unit for full speedometer calibration flexibility. I have the factory wiring diagrams (in good condition) for our truck - if you need any pages copied or additional help, just reach out to me @ thereal.jmiller@gmail.com

I hope this helps!
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