70 c10 harness options with ls swap soon - The 1947 - Present Chevrolet & GMC Truck Message Board Network

454C10CHEVY · 03-20-2020, 02:28 PM

Hey guys My question is if I have a painless harness ready to go in and I am doing an LS swap within the next year How can I adopt stand alone harness to the painless harness so I only have one fuse block?

**Pythonater** · 05-29-2020, 11:57 AM

Might this be the wtg if you're going with Painless?
https://www.painlessperformance.com/wc/60617

LS short box · 05-31-2020, 04:33 PM

That looks like a nice integrated kit but kind of expensive. Doesn't include the ecm.
I've used the Painless chassis kits on a number of LS swaps. You really don't need any integration of the chassis harness to the LS harness. Just the 12 volt wire that has power in start and run. Painless techs told me not to run the 12 volt ecm constant thru the Painless fuse block, run the ecm 12 volt constant wire directly to the battery. I just run the 12 volt constant off the starter stud.
Most LS harnesses come with a small fuse block (5?), a couple relays (fuel and fans) and a OBD port and check engine light. Its pretty compact. I put mine right behind the glove box.
Good luck with your swap.

03-20-2020, 02:28 PM	#1
454C10CHEVY Registered User Join Date: Aug 2012 Location: PITTSBURG,CA Posts: 100	70 c10 harness options with ls swap soon Hey guys My question is if I have a painless harness ready to go in and I am doing an LS swap within the next year How can I adopt stand alone harness to the painless harness so I only have one fuse block? __________________ 72 C10 SWB Stepper 350/TH400 (might sell) 70 C10 SWB Stepper I6/4SPD (CURRENT PROJECT) 00 Silverado Rc 1500 2WD 5.3 09 Silverado Cc 5.3 2WD 4/6 DROP 04 Silverado ext 5.3 4WD

05-29-2020, 11:57 AM	#2
Pythonater New Member Join Date: Nov 2007 Location: Alberta, Canada Posts: 5	Re: 70 c10 harness options with ls swap soon Might this be the wtg if you're going with Painless? https://www.painlessperformance.com/wc/60617

05-31-2020, 04:33 PM	#3
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,917	Re: 70 c10 harness options with ls swap soon That looks like a nice integrated kit but kind of expensive. Doesn't include the ecm. I've used the Painless chassis kits on a number of LS swaps. You really don't need any integration of the chassis harness to the LS harness. Just the 12 volt wire that has power in start and run. Painless techs told me not to run the 12 volt ecm constant thru the Painless fuse block, run the ecm 12 volt constant wire directly to the battery. I just run the 12 volt constant off the starter stud. Most LS harnesses come with a small fuse block (5?), a couple relays (fuel and fans) and a OBD port and check engine light. Its pretty compact. I put mine right behind the glove box. Good luck with your swap.

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