what is needed to incorporate ls harness into stock wiring? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

solidaxel · 04-05-2016, 04:07 PM

Your L S will be a stand alone harness, with a switched 12VDC and a constant 12VDC

**mongocanfly** · 04-05-2016, 06:35 PM

Ditto to what solid says..the ls stands alone just be sure to ground everything ( motor to frame, body to frame, motor to body, of course battery to motor..) you can't have to many grounds, but on your truck side harness you will still need power as well so dont forget to hook that back up to. I used the big red wire from the hei for my switch on power, the original starter wire from the key went right back on the ls starter and the hot side wire from the starter went back up to the 2 pole connector on firewall above distributor and that should keep all your truck electrical working and that's where I picked up my constant power.

Robznob11 · 04-05-2016, 10:27 PM

Yea your ls harness will have a battery hot, ign hot, ground, fuel pump,tac, tcc brake, and vss, if your lucky it may have e fans depending on who built it. The battery power should feed relays one for ls harness main, and one for fuel pump relay, you should have a minimum of 4 fuses to run your injectors and other . You can tie it in but it's best to Lear it stand alone less mess to chaise later.

solidaxel · 04-05-2016, 10:39 PM

Quote:

Originally Posted by mongocanfly

Ditto to what solid says..the ls stands alone just be sure to ground everything ( motor to frame, body to frame, motor to body, of course battery to motor..) you can't have to many grounds, but on your truck side harness you will still need power as well so dont forget to hook that back up to. I used the big red wire from the hei for my switch on power, the original starter wire from the key went right back on the ls starter and the hot side wire from the starter went back up to the 2 pole connector on firewall above distributor and that should keep all your truck electrical working and that's where I picked up my constant power.

That is exactly where I tied in my Hot and Switched

Temp gauge to pass side head
Oil sender to by pass in LS
Starter to ing. switch, same location
Alt lead went to the Alt

It really is that a plug and play system !

04-05-2016, 04:07 PM	#1
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: what is needed to incorporate ls harness into stock wiring? Your L S will be a stand alone harness, with a switched 12VDC and a constant 12VDC __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

04-05-2016, 06:35 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,698	Re: what is needed to incorporate ls harness into stock wiring? Ditto to what solid says..the ls stands alone just be sure to ground everything ( motor to frame, body to frame, motor to body, of course battery to motor..) you can't have to many grounds, but on your truck side harness you will still need power as well so dont forget to hook that back up to. I used the big red wire from the hei for my switch on power, the original starter wire from the key went right back on the ls starter and the hot side wire from the starter went back up to the 2 pole connector on firewall above distributor and that should keep all your truck electrical working and that's where I picked up my constant power.

04-05-2016, 10:27 PM	#3
Robznob11 Registered User Join Date: Feb 2004 Location: brownfield texas (west texas) Posts: 1,937	Re: what is needed to incorporate ls harness into stock wiring? Yea your ls harness will have a battery hot, ign hot, ground, fuel pump,tac, tcc brake, and vss, if your lucky it may have e fans depending on who built it. The battery power should feed relays one for ls harness main, and one for fuel pump relay, you should have a minimum of 4 fuses to run your injectors and other . You can tie it in but it's best to Lear it stand alone less mess to chaise later. __________________ The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS



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