3800 swap harnesses (Page 4/20)
3.8 SC NOV 21, 01:09 PM
I have not met Dan in person, but what I have seen here on PFF and his photos that he list in his signature, is great for a person that is a DIY, like me. I have saved a lot of money and have been able to use that money on other parts of the swap, because of him. Dan, I thank you. I have been watching this thread and the harness that you are making. This is pretty much the same way I do my harnesses. Only now, I am making a harness for me and I am going the extra mile to make sure, to hide the wires, plumbing, or cables from showing, when you open the hood. I like that jig that you have there. That is alot more compact than "the engine on a cradle with a false firewall design" that I use. As for the trolls- GO AWAY AND LEAVE US ALONE!!!

Again Thanks,
Don Z.
FIEROFLYER NOV 22, 10:45 AM
This the completed C203 with three wires hanging out of the harness the green one is from the PCM C1 pin 55 which is VSS out, the second is pink which is tapped off C203 pin F the ECM ignition and the third is yellow which is from C203 pin G VSS high to speedo. These wires are for the speedo buffer circuit which consists of two resistors, one capacitor and a diode to adapt the PCM VSS out to work on the Fiero speedo.



The C500 takes a little more wire to be able to reach it connection point over above the battery, I have found a measurement of 50 inches from the harness where it goes through the firewall.
C500 pin A2 is ground connect to chassis ground
C500 pin A4 is for starter ignition on auto tranny cars this wire goes to the neutral switch on the tranny
C500 pin B3 is from the charge indicator on the gauge pod it can either be connected directly to the alternator pin L or to the PCM C1 pin 36 then PCM C2 pin 61 connects to the alt pin L. Going through the PCM just gives the PCM control of the alt charging.
C500 pin C1 is the +12v feed to the reverse light switch mounted on the tranny on auto and 5 speed cars it is connected to the tranny switch pin B on the 4T60E and 4T65E trannies.
C500 pin C2 this is the feed from the coolant sensor to the coolant gauge
C500 pin C3 this is the tach feed and comes from the ignition module harness connector pin E which will have to be added into the harness on most cars.
C500 pin D1 is the ground to turn on the cooling fan and comes from PCM C1 pin 6
C500 pin D2 is the ground for two stage cooling fans and comes from PCM C1 pin 5. from my experience only 84 Fiero's with A/C have two stage cooling fans.
C500 pin D3 this is the feed from PCM C1 pin 75 to turn on the coolant lamp on the Fiero gaugse
C500 pin E1 is the return path from the reverse light switch which is connected to the tranny switch pin F on the 4T60e and 4T65E trannies
C500 pin E2 is the ignition feed for the starter on manual tranny cars and goes straight to the starter.
C500 pin E3 is the +12v ignition feed for the ignition module
85LAMB NOV 22, 11:24 AM
Fieroflyer
I just wanted to thank you for a very helpfull tread
Happy Thanks given and + for you
Misery NOV 22, 06:56 PM
Dan,

Keep up the great work, I would guess that there is a large but silent majority, such as myself who has been a member for quite a long time and benefited greatly from the information on this board, but for one reason or another choose not to post but rather use this as a resource of information.You and many others who take the time to share your knowledge and experience with us without all of the grandstanding and finger pointing are very under appreciated so PLEASE continue...

"You get what you give and people get what they deserve"
Fierostarvin NOV 22, 07:03 PM
What Misery said!!!
Jncomutt NOV 24, 12:56 AM
Keep it going, this thread is great!
aaronrus NOV 24, 03:42 AM

quote
Originally posted by darkhorizon:

I dont understand it either Z, everyone loves doing the 400% extra work to make sure its done the absolute most complicated way possible.



for once i agree with darkhorizon, however, if you are looking for the cleanest install possible, this is definately the way to go.
FIEROFLYER NOV 24, 10:17 AM
Ok the harness is fully assembled the last thing I did was wire up the relays. For the relays there is the Fuel pump relay, the fuel pump speed control relay and of course the A/C clutch solenoid relay. For the fuel pump you can wire it up the same way the Fiero did using the oil pressure switch to keep the pump going once the engine is started which will work just fine. I prefer to wire it up using the 3800SC relays that way the PCM controls the fuel pump, either way it is best to have the wiring diagrams right in front of you to make sure it gets done right.
At this point is there any thing I have missed that needs explaining or photos of shown to help explain how I build a swap harness.
As mentioned numerous times above this is not the easiest or fastest way too build a harness there are many ways to do so this is just how I like to build a harness and how I build the ones I sell to those who either do not have the time to make their own or just want to buy one to save the trouble of building one. Dan
smartaxel NOV 24, 10:45 AM
Dan,

Thanks for the thread.

I lack the time to do the wiring, and when the time comes will prob. be buying a new harness. This thread is most appreciated. It's a nice, professional looking install!
3.8 SC NOV 24, 11:11 AM
You showed C203. But, you might want to show what C500 looks like and how to remove it, for the folks that are not wire handy. This way they will know what connectors to send you. Great write-up!

Don Z.

[This message has been edited by 3.8 SC (edited 11-24-2007).]