3800 swap harnesses (Page 14/20)
darkhorizon MAR 01, 01:38 PM

quote
Originally posted by carbonfiber_kid:

Dan
Sent you a PM a while ago about a harness



Dan is done with harnesses... But seeing how you are in the area.. I could possibly entertain the idea of coming out and doing the harness with you one night.
Chug MAR 05, 12:04 PM
I have a question. I have been looking at just about all the ECM wiring info that is out there. I find some differences in every setup that I see and the setup that I have. I have been studying the pinouts and what to hook up where, I'm finding that on the harniss that I have that some of the wires that call to be hooked up are not in my harness.

The question I have is, if there is a wire that is called for on the C1- C2 connectors and it is not there am I supposed to add the wire or is that something that isn' going to work.

i.e. C500 pin D3 this is the feed from PCM C1 pin 75 to turn on the the coolant lamp on the Fiero Gauge (I don't have a C1-75 wire)
Chug MAR 07, 08:16 AM
Anyone??
FIEROFLYER MAR 07, 06:41 PM
Unfortunately GM in all their lack of wisdom made wiring differences between the different years of 3800's and models cars for 3800 engines.
What is used on a GTP is not on Bonneville or other car.
You need to make your harness match the PCM you are using for example the coolant light wire is used on the GTP and not Bonneville so if you are using a GTP PCM add the wire if not don't. Dan
Chug MAR 08, 11:17 AM
So I'm guessing that I'll need the actual pinout for a 99 Olds LSS before I do anything major to the harniss
can_add MAR 12, 12:11 PM
So for the oil pressure Sensor, I have the 2 wire sensor from the 3800sc. One goes to C2 Pin 19, the other is the ground, how or where does the gauge get its reading from?

I want to included the "sport mode" button found in the GTP. It's just one wire that goes to ground right, What Pin does the wire come from?

thanks

Also me and my friends were debating this the other night. Is it better to have two power wires coming from the battery one to the alt and the other to the starter or just to have one that goes to the alt and jumps to the starter. Or does it really matter.
CC Rider MAR 12, 01:01 PM
one that goes to the Starter and jumps to the Alt.
Dennis LaGrua MAR 12, 01:17 PM

quote
Originally posted by can_add:

So for the oil pressure Sensor, I have the 2 wire sensor from the 3800sc. One goes to C2 Pin 19, the other is the ground, how or where does the gauge get its reading from?

I want to included the "sport mode" button found in the GTP. It's just one wire that goes to ground right, What Pin does the wire come from?

thanks

.



The GTP oil pressure sender won't drive the oil pressure gauge as its a switch not a gauge sensor. You'll need to use the 88 Fiero V6 sender. Also be advised that the temperature gauge will require that you use the early GTP ETS 3 pin sensor. The center pins on thse sensors are the gauge connections. As for the sport mode switch, I don't see this on any of the PCM diagrams that I have.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE WILDCAT"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 03-27-2009).]

fierocarparts MAR 12, 02:38 PM
All of this has gone WAY over my head. I know wiring is very simple for me. I guess I will keep this aside until I know the donor car and then it should be clear.
I would like to thank everyone for the input into this very important Fiero piece. Please, in the future be patient as I will be asking these same "stupid" questions. Big thanks to Dan for not being an ass and refusing to help the DIY. I think even with him helping the DIYer he still has more harnesses to build than he has time in which to do them.

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Why fight to be accepted by people you don't actually want to be like?

darkhorizon MAR 13, 01:58 AM
sport mode = performance shift

Its a wire on the pcm that you can send to ground to enable performance shift...... its nothing special if you use a tuned pcm... you pretty much just want the best shift settings at all times.

I use mine for a "severe shift" mode, which puts it into a mode where it wont shift until dang near redline at part throttle.