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Discussion Starter #1
I know there are several videos online for building a stand alone harness, just wondering which one you thought was easiest to follow. I have a 98 S10 side-step with the original ecm and a 2005 L33 5.3 with the original ecm. I will most likely get an integrated harness from CPW but would like to be able to crank and run my engine for test purposes.
 

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To my knowledge all the pink wires in the harness need 12v to run. All the extra misc sensors and connectors not being used can be taped up or completely de-pinned and removed from harness all together for a cleaner more simple set up. I would go with the CPW harness just for ease of install and reliability. I have personally seen a great LS swap go south because of interment electrical gremlins causing run-ability problems.

Edit: Here is an example of how basic (and backyard mechanic) you can make it.

 

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reds battery unswitched
pinks switched
blacks ground(sometimes white/black stripe,sometimes black/white stripe)

each wire needs to be addressed,dont just wholesale connect.
 

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reds battery unswitched
pinks switched
blacks ground(sometimes white/black stripe,sometimes black/white stripe)

each wire needs to be addressed,dont just wholesale connect.
Orange = Battery switched on a lot of GM harnesses.
Personally, I'd just buy an Ebay stand alone harness for cheap
 

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I have done stand alone harness . Some work fine some dont .like ken said them gremlins .Your harness is already 15-16 years old . MY 2003 i bought CPW HARNESS .glad i did it was like they had my truck there fitted perfect..
 

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Discussion Starter #7
I will buy a fully integrated harness from CPW, I want to put something together to crank engine and do some testing etc.
 
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