With my incredibly hectic schedule with work, kidís and wife in school I have been moving along at a drunken snails pace on my chassis. Although this didnít slow me adding to the pile of parts that I have obtainedÖ in my quest to build a nice rig with some cool shat and having like zero budget to boot that has been tough but Iím some how making it happen slowly. Anyways since I work in the Performance industry I have a far amount of contacts at good deals on parts. In my never ending quest to pinch and stretch every dime I can scrape together so build this thing I had a customer send me a stock 1999 6.0 truck engine wiring harness with coil packís and everything. The first thing I did was research. Knowing that this was a DBC and mine would also be DBC this should be a no brainer. I started off on Pirate4x4.com and that went to crap fast with all the B.S. postís in there. My goal in this was to make a stand alone harness out of the factory harness. I found few site that offered a small amount here and there but not everything. I finally found a site www.lt1swap.com this site has there crap together.
Here is the link to the PCM pin out and what needís to be removed and what getís power
This is what I started off with Öa stocker harness
I stripped off all the factory tape, convoluted tubing
No the wife wasnít pissed about me using the dining room table as a bench thatís why I love her
As I removed the tape and tubing I used small zip ties to loosely hold it together. I also used one before and after when the wiring split out to sensors then used one on that part of the harness too as to hold it together in hopes it didnít completely fall apart lol unfortunately I did not get pics of this but you get the idea. Once I was done with that is was on to getting the harness stripped down.
First up was to remove the gray plastic coverís on the back of the PCM plugs
Once that was done I moved on to the blue connector to start removing unwanted wires. Like any emission controlís and the transmission harness since I was using a TH400 ( Please do one connector at a time to insure you donít get to far ahead of yourself and they red and blue pieces can be swapped and that will release the smoke in your PCM.) the blue and red part of the PCM connector are easly removed by using a small screw driver or pick. On the side of each connector depress the white tab and gently pull up then move to the other side to remove completely.
Once thatís done itís time to rip and tear lol the pins are easy to remove. On the back of the plug each wire has a number cast into it. ( mine was dirty so I cleaned it up ) just remove the pins not used but following the guidline here www.lt1swap.com/99-02_vortec_pcm.htm be sure to follow the color coded parts. The pins are removed by gently lifting the tab and pulling the wires outÖÖitís that easy
Next you will need to cut the all the wire off the plugís GM happily named C100 and C152 and prepare to remove move these too ( make sure to leave the fuse block connector intact for now)
At this point I started fishing out each wire and completely removing it from the harness. There will be time that you will get to the other side of the loom to find a connector with two wire. One black and what ever the other color is. Go ahead and pull the black one out too. This is a ground and will not be needed. Most all of these black wire will go to a common point where 5-6 wires are joined. I just cut it at the heat shrink and moved on.
Once you have pulled all the useless wire our you should have a pile close to this.
Note the big round connectorÖ..yeah thatís the transmission harnessÖ.yuck
Another quick note and something that bit me was watch the harness as you go. Make sure to lightly tighten up those zip ties. Since you are removing wire they are now loose and will slide down the wires and screw you upÖlol
Next up is the factory fuse block. This one is pretty easy. Here is another link to the pin out on it.
note the big purple wire. This is the starter solenoid wire. I removed this from the harness too since itís a buggy I will wire my own off the push button.