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Ok guys you have probably answered this a million times by now but I have to ask, is there any way to get the stock wiring harness and pcm out of a 94 trans am to work in a 69 camaro without the high dollar wiring harness made by painless or street and performance? thanks Tom
 

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yes, it takes time and patience. Purchase the electrical service manual for the vehicle the harness is coming out of. It takes time tracing wires to find the power, grounds, and wires for the fans, fuel pump, etc. It can be done.
Kevin
 

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I will be doing this with a '96 LT1 into a '68. I have the service manual and the '68 wiring diagram. I'm trying to get my head around in and figure out where to start. Any suggestions?
 

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I'm not familiar with the LT1 harness, but if it's anything like the 99-02 LS1 harness (in concept, at least), I'd do something like this...

1) Leave everything connected to the engine/trans/PCM as they were in the '96.

2) take inventory of all the connectors that aren't hooked up to anything (ie, used to go to the body harness, fuse block, etc). Write down a description of each of those connectors, and list out each pin (the pins may be identified with a letter if they are like the newer ones) and the color of wire going to it

3) Sit down with the '96 wiring diagrams and figure out what connector number each one of those is, and what each pin is supposed to hook up to on the '96, and write it down next to each pin as listed out in step 2.

4) Go through your list pin by pin and figure out whether it's something you need to keep or not. It's OK to put down some "maybes".

5) For the stuff that you are keeping, figure out what it needs to connect to on the '68 harness. Generally that's going to be BAT, RUN, tach, speedo, checkengine light, etc.

6) Add relays for the RUN, fuel pump, and fan circuits as needed. List out all of the relays you are going to use, and then list out each pin on the relay. Fill in the blanks for each pin, one pin at a time. Some of the pins will connect to the engine harness. For those, you should go back up the you engine harness connector list and add notes for those pins saying something like " - to pin 86 of Relay RUN2".

7) Go back up to the top of your list and start connecting wires, one pin at a time. Once you've checked off every pin on all of the connectors and all of the relays, you should be done.

I spent a lot of nights researching wiring for my LS1 swap and pulling my hair out until I finally sat down and went through it pin-by-pin one pin at a time for the body & interior connectors. No need to worry about the individual sensor connectors and PCM connectors--those are all either hooked up, or gettin eliminated, and either way don't need to touch them until you are ready to do a cleanup on the harness. There's nothing complex about hooking up 1 wire... you just have to do that 30 or 40 times or so.



7) Go back to the top
 

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Rodder sums it up very nicely, but I'll add a couple things.

I labeled each connector as it came off the new engine. Masking tape and a felt pen work just fine for this.

After cleaning it up and before making any mods, I took the harness and using the factory diagrams and pinouts, checked each and every wire with an ohmmeter. I figured I would be a lot more comfortable correcting any electrical problems in the living room in front of the TV rather than in the car trying to figure out why it won't start or run right after everything is installed.

Keep in mind any changes you will need to make as far as fitting everything up to your car. I moved the ECM and datalink to the glove box, the oxygen sensors to the header collectors, and the fuel pump and fan relays are nowhere near where they were in the donor car.

I mocked up the harness to the engine/trans while they were still sitting on the floor and worked out the routing of the looms.

It all made the actual swap as easy and painless as possible. Other than that, it was pretty much as Rodder said.
 

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Yes, I bought a tuning program (Jet DST) and am doing my own tuning. It reads the program from the car computer onto your computer. You then make any changes that you want then load it back into the car. If you are running the engine in its stock configuration, the stock tune will work just fine with only the changes to emission equipment, VATS, etc. being necessary. If you are using an auto trans and the donor car was geared differently than yours, changes to the trans shifting will be required.

I installed a mild cam which made changes to the fuel and timing tables necessary. It's much like jetting a carb, modifying advance curves, and playing with trans governer weights but with waaay more control and options and the ability to easily go back to a previous calibration if it doesn't work out. I recommend a datalogging program to chart the effects of your changes.

You can find a lot of info on LT1 tuning on the forums at camaroz28.com
 
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