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4G64 Fuse box with 4G63 Wire Harness

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agarcia

10+ Year Contributor
69
24
Jun 27, 2011
Lancaster, Pennsylvania
OK, I got a couple of questions with this swap, by the way i already started the swap and there is no going back, the 4G63 engine is mounted with the 4G64 M/T, i'm using the GST engine wire harness, the problem is that the fuse box has a female connector and the GST harness has a female connector and i cannot connect the two. Should i switch to the 4G64 wire harness? If so, what modifications do i have to do to it? I know that the 4G64 does not have a knock sensor. I have done a lot of research but cannot find any information on this matter. I also want to know if it is necessary to rewire the fuel pump now that i have the turbo engine, can i just use the fuel pump from the GST?

Pictures 1&2 are the Spyder GS fuse box and connector


Pictures 3&4 are the connector fom the GST wire harness


Pictures 4&5 are the connector from the 4G63 Fuse box and Fuse box



Please help,

Thanks!!
 
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Well, I'm not wasting time, I just done splicing and soldering the connector for the fuse box, I will be putting it together in the morning, still have to do the fuel pump rewire, can I use the spyder fuel pump or should I use the one from the gst?

OP, you still have the GST harness, so whatever makes it easier for you! I think the resistor pack is probably the toughest part for someone who doesn't like wiring diagrams. But great progress and basically the home stretch thus far anyways. The skills learned by patiently doing a job like this (whichever way it's done) are priceless in the real world--and you have a turbo DSM at the end.

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Well said, this had definitely been a learning experience. Thanks for your help all, I will be posting progress.
 
There's no reason at all why it can't be spliced in. One just needs to pay close attention to the schematic and double check their work with a multi-meter. Some wire colors may not match up. The ideal way might be to de-pin the junction blocks from the Spyder GS and GST harnesses and work from there--rather than chopping the harness as best possible. I'm sure it can be done but it needs someone to actually have the parts (like you guys) and plan it out. Maybe it's been done? I don't recall how many junction blocks there are but there shouldn't be too many. Disassembling the harness in-car is pretty annoying, though.

Transplanting the entire harness, clips, brackets (if required) from power-generation to the ECU is the option you suggested and I think if you have time and access to everything, that is probably the hands-down best option. A provision for the convertible top may need to be added for power. The end state for that is you just plug everything in and go. I've never done this but I know it will not be fun.

There are so many similarities between the Spyder GS and Turbo harness that a few mods to the harness in a separate loom along with adding the appropriate pins to the ECU feels like the easiest and least time consuming option to me (if I did it myself). For a novice, I can see that it may take longer and that's ok, but for me, I can make all those adjustments, loom, protect, and run the wire, verify all of the ECU pins one more time in probably an hour or two with no hiccups (broken irreplaceable connector, ran out of pins, tape, etc.)

OP, if you have a pin 61 on your ECU with a wire in it, pull it and tape it off as it's not used on the turbo ECU. I don't think there will be any issue with leaving it in, but I have not tested that. That should be the only one you have to pull. It's the "fuel tank differential pressure" sensor. If you have any other wires in the ECU you aren't sure of, go ahead and post their position and they can be verified.
 
For the relay to blow you must have something wired wrong. If its not blowing a main fuse then its between relay and fuel/ignition system.

Not much help I know sorry.

Please update when you get it running and what you did.

I had to move so no progress on my swap plus we need to finish body filling and painting the engine bay, of and put the rest of the engine back together...
 
Thanks, I have a very good friend that knows how to work on car wiring, he's going to take a look at it Wednesday, I don't know ifi mentioned, this is the first time I work ons project like this and I'm nota mechanic, though I love dsm's, I will keep posting progress, thanks for everything
 
OP, if you have a pin 61 on your ECU with a wire in it, pull it and tape it off as it's not used on the turbo ECU. I don't think there will be any issue with leaving it in, but I have not tested that. That should be the only one you have to pull. It's the "fuel tank differential pressure" sensor. If you have any other wires in the ECU you aren't sure of, go ahead and post their position and they can be verified.

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Is this the relay that plugs to pin 61 on the ECU? This is the fuel pump from the spyder N/A, the fuel pump from the turbo does not have this plug.
 
Awesome! please do share what was done so I can go right to it :)

I am doing so much already on this project its crazy and I could use any time saving help I can get.
 
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After i spliced the connector from the gst fuse box to the gst engine harness the wires had to be repined to match the wire colors from the spyder fuse box connector, note that the gst harness that i have is for automatic transmission and this car is a manual,

See picture below, this is what i did to bypass the neutral switch, i know there are other ways around it but this works.
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There is also a wire that connects to one of the blue connectors from the gst harness that goes inside the car next to the ecu that has to be repined as well, i will take pictures of it and post later.

So resuming what was done, i used a 4G63 engine from a 1997 eclipse gst with A/T wire harness, bolted the 4G64 M/T transmission to the 4G63 engine, there is a bushing (not sure what is called) on the crank that has to be removed to put the M/T flywheel (i used the wet paper and a socket trick), mounted the motor in the car, rewired the fuel pump and swap the fuel pump with the one from the gst donor car (will upgrade to walbro later). Still need to swap the exhaust with the one from the gst. Any questions please let me know, i'll try to help the best i can though i believe there is people in this forum more suited to help than me, i appreciate all the help, i might still post some more here as i am not completely done but am happy that the motor already starts. :thumb:[DOUBLEPOST=1408018233][/DOUBLEPOST]
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Shortcut is the video of car running without exhaust.
 

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Awesome, that doesn't sound bad at all and basically what I planned on doing.

The the gst ecu was auto too then? Ill be using a gst manual harness and ecu but the spyder was an auto, I thought there was a relay to jump in the box or something, have to look that up again.

congrats!

Thanks for posting back too!

check out our engine bay progress, gonna get the rest finished today and get ready to drop block in!
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I don't know anything about the 4g64 but my best suggestions is to test every single line on the fuse box connector and see what line does what, this way we all can help which a lot of us have books of our own car (Tubro).

Test the lines and let us know so we can guide you.[DOUBLEPOST=1409168486][/DOUBLEPOST]
The gst ecu was auto too then? Ill be using a gst manual harness and ecu but the spyder was an auto,
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Auto and Manual ECU's are the same, the auto has an extra ECU for the transmission which is not used on the manual.
 
Just for anyone else searching for this, since this thread comes up in google, here is what I found.

The connectors are wired exactly the same.

I cut the connector off the GST power harness
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Cut the connector off the spyder GS power harness

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and soldered the GST one on. Pretty simple really I've been worried about this for awhile, getting very close now

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OK, I got a couple of questions with this swap, by the way i already started the swap and there is no going back, the 4G63 engine is mounted with the 4G64 M/T, i'm using the GST engine wire harness, the problem is that the fuse box has a female connector and the GST harness has a female connector and i cannot connect the two. Should i switch to the 4G64 wire harness? If so, what modifications do i have to do to it? I know that the 4G64 does not have a knock sensor. I have done a lot of research but cannot find any information on this matter. I also want to know if it is necessary to rewire the fuel pump now that i have the turbo engine, can i just use the fuel pump from the GST?

Pictures 1&2 are the Spyder GS fuse box and connector


Pictures 3&4 are the connector fom the GST wire harness


Pictures 4&5 are the connector from the 4G63 Fuse box and Fuse box



Please help,

Thanks!!
Hello, did you ever figure out how to wire in the 99’ Eclipse GST Harness into 99’ Eclipse GS that I had removed the 4G64 and put in 4G63T engine into.
 
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