2002 Wiring harness question

To save money I was planning on using the wiring harness that came with my LS1. I talked to a guy up around Dallas and he said to use an S&P harness instead because it was easier to install. The harness I have is already installed on the engine and I'm sure there are a few wires that I won't be using but I think it will work fine. The guy I bought the engine from already removed the VATS out of the computer and flashed it for gearing, tires, etc.... What do you guys recommend?

Thanks, Lance

It basically boils down to how much is your time worth to you. I would use the factory harness and just clean it up ( remove unusable wires ) that's what I did with my 04 harness. It's not that hard if you get a schematic. But if your not comfortable with it by all means get a reworked harness from another source. :thumb: That's my $.02

If you feel comfortable I say go for it! I did mine and it was easy for me. You will need all the diagrams from the donor and your truck. You will also need a fuse/relay block to add to the new setup among other things.

Thanks for the replies! I love a challenge so I'm going to go with the original harness. GMCWantsLS1, what type of fuse block would you recommend? I have the truck dealer manual but I need to get the 2002 wiring diagram. Does anyone here happen to have the pinouts?

I reworked my 2002 harness. I went and got the mating connectors for the inline harness connectors in the harness already. I have it set up so that the whole engine harness is disconnectable and every connection is watertight. Also all power circuits are fused as designed by GM. It's worth spending the time to do this right so it doesn't become a problem in the future. If you need part numbers for the connectors let me know.

2002 LS1 PCM Blue connector 1

2002 LS1 PCM blue 2

2002 LS1 PCM red 1

2002 LS1 PCM red 2

Awsome info here again! PSWired, I"ll let you know when I receive the motor on Thursday what I'm gonna need. Thanks for the input bro. RedHeartBeat, I got your email and I think you just put me into overdrive with the wiring pinouts. I'm going to make a complete installation guide with part #'s on this swap so we'll have it.

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Originally posted by PSWired@Apr 5 2005, 07:41 PM
I reworked my 2002 harness. I went and got the mating connectors for the inline harness connectors in the harness already. I have it set up so that the whole engine harness is disconnectable and every connection is watertight. Also all power circuits are fused as designed by GM. It's worth spending the time to do this right so it doesn't become a problem in the future. If you need part numbers for the connectors let me know.

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I also did this. I did no cutting to the orignal harness. I mated the GM connectors to a 1997 Camaro LT1 fuse/relay block. With this block came the harness for the e-fans and the connector for the cruise control so it just got better and better. I did splice into the orignal 2002 LS1 harness for speedo, tach and a couple of other things. Using the connectors worked out nice when I got a added the SLP cooling fan switch, it just pluged right in! :thumb:

I finally had time to go out and look at my harness. There isn't much to clean up if any that I can see. Every wire goes to something except for the 4 connectors and a vacuum line right at the computer. There are also 2 connectors one white and one blue that go through the fire wall.

So here is what I have left:

1. Blue 10 pin connector to cab.

2. White 10 pin connector to cab.

3. 1 single connector with large purple wire to it.

4. Grey 10 pin connector by pcm - only 8 wires used.

5. Black 8 pin connector by pcm - only 5 wires used.

6. Black 10 pin connector by pcm - only 9 wires used.

7. 1 small vacuum line wich tee's into the back of the intake. Not sure what this went to.

8. 1 large red wire from battery to old fuse box.

I think Items 1 or 2 go to the Data port.
I glanced at a guys 2002 WS6 and looked like items 4, 5 and 6 above go to the fans and the fuse box on the drivers side fender. Has anyone used the T/A fuse/relay box or is it too much trouble?

If you have any input, please let me know.
Thanks

Item 1 blue connector

item 2

3 is for the starter, you won't need this one. 7 probally used for the AC controls, I think I hooked this one up to the vaccuum line going to a cansiter that goes to the AC controls to switch the inside vents. You can use the T/A fuse/relay box, but I think it has two boxes hooked together and a bunch of things you won't need.

6 part one

6 part two sorry about all the post

4 part one

4 part 2

5 part one

5 part two hope all this helps. This is vin G 2002 f-body.

You just fixed me up bro!! thanks for the pics!! I've already saved them if you need to delete them from taking up space here if not I'm sure someone else will enjoy them. Thanks again! :rock:

What does the purple one do for the starter? Does it go into the harness with hte fans?

I don't know how this works specifically on the F-body harnesses, but typically the purple wire goes directly to the starter solenoid. You'll want this run though a relay to a +12v supply. The relay coil should be hooked up to the crank line from your ignition switch through the neutral start switch on the side of the trans. There should be a yellow wire going into the neutral start switch from the ignition switch and a purple wire coming out going to the starter relay coil.

Thanks PSWired, I'll take a look.

Quote:

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Originally posted by PSWired@May 1 2005, 11:20 PM
I don't know how this works specifically on the F-body harnesses, but typically the purple wire goes directly to the starter solenoid. You'll want this run though a relay to a +12v supply. The relay coil should be hooked up to the crank line from your ignition switch through the neutral start switch on the side of the trans. There should be a yellow wire going into the neutral start switch from the ignition switch and a purple wire coming out going to the starter relay coil.

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Sounds right. I didn't want to add a neutral safety switch(another one) so I just hooked up the starter like it was on the 305. I think the f-body setup will continue to crank the starter until the engine starts. I.E. if you had 4 cylinders disconnected it would crank until it fires and is running.

Yep, purple wire comes out from the ignition switch directly to the starter solenoid. Mine ran through the clutch switch and then to the starter. I removed the one that was in the LS1 harness and used the factory one from the original setup.