3.4 swap wiring question

toyotabruce · 07-02-2009, 12:23 PM

i have a donor vehicle and im just wondering what wiring i need from under the dash. can i cut right by the ecu or should i get all of it behind the dash. thanx for the help

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fillsrunner4 · 07-02-2009, 02:27 PM

Dont cut any wires... You need to splice the new motors harness into your dash harness. Your gonna have to get the wiring diagrams for your exact two rigs the donor and your original. Go check out the motor swap section of this forum and do some searching and youll find alot of info on this swap. Dont rush into it cause it sounds like you have alot of homework to do first.

fillsrunner4 · 07-02-2009, 02:27 PM

welcome BTW

toyotabruce · 07-02-2009, 04:57 PM

ive read about the swap alot but i guess till i have my hands on it ill understand it better. so on my stock truck where will i be splicing into the new harness. do i splice the new harness into the existing right by the ecu or do i put the entir new harness in there and splice into all the components. also do i need the fuse panel and everything else under there. thanx for the help very appreciated

RobD · 07-02-2009, 05:10 PM

Quote:

Originally Posted by toyotabruce

ive read about the swap alot but i guess till i have my hands on it ill understand it better. so on my stock truck where will i be splicing into the new harness. do i splice the new harness into the existing right by the ecu or do i put the entir new harness in there and splice into all the components. also do i need the fuse panel and everything else under there. thanx for the help very appreciated

No, you touch nothing under the dash. When you pull the passenger side kick panel, you'll see the computer for your 3.0. When you remove it, there are probably three connectors that go into it, as well as two larger connectors that go to your engine.

The two larger connectors are your body harness. When you pull the 3.0, you're going to remove the wiring harness that is attached to the engine. This will be the three smaller connectors as well as the two larger ones that are attached to the engine itself. The two larger connectors that are inside the truck stay there.

These are the engine side connectors. You'll need to cut these off the engine harness and splice the 3.4 engine harness into them. The two matching plugs under your dash will then plug back into these when all is said and done.

toyotabruce · 07-02-2009, 07:27 PM

thanks alot for the help

07-02-2009, 02:27 PM	#2 (permalink)
fillsrunner4 Registered User Join Date: Jun 2004 Location: Sammamish, wa Posts: 2,725	Dont cut any wires... You need to splice the new motors harness into your dash harness. Your gonna have to get the wiring diagrams for your exact two rigs the donor and your original. Go check out the motor swap section of this forum and do some searching and youll find alot of info on this swap. Dont rush into it cause it sounds like you have alot of homework to do first. __________________ 94' toyota 4runner (Many a change!) purchased bone stock, NOW... SAS, 39" Iroks, Rear Leafswap, 5.29's , Air locked front, Welded rear, Chevy 4.3L V6, 5spd swap, dual T/C's MC10R10, flatbelly with custom skids, sliders, Chopped, Bobbed and so much more. Might as well start reading this if ya want know more Fillsrunner4 3.4crawler Build Thread Fillsrunner4.3 crawler (Part Two) build thread

07-02-2009, 02:27 PM	#3 (permalink)
fillsrunner4 Registered User Join Date: Jun 2004 Location: Sammamish, wa Posts: 2,725	welcome BTW __________________ 94' toyota 4runner (Many a change!) purchased bone stock, NOW... SAS, 39" Iroks, Rear Leafswap, 5.29's , Air locked front, Welded rear, Chevy 4.3L V6, 5spd swap, dual T/C's MC10R10, flatbelly with custom skids, sliders, Chopped, Bobbed and so much more. Might as well start reading this if ya want know more Fillsrunner4 3.4crawler Build Thread Fillsrunner4.3 crawler (Part Two) build thread

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07-02-2009, 04:57 PM	#4 (permalink)
toyotabruce Registered User Join Date: Jun 2009 Posts: 3	ive read about the swap alot but i guess till i have my hands on it ill understand it better. so on my stock truck where will i be splicing into the new harness. do i splice the new harness into the existing right by the ecu or do i put the entir new harness in there and splice into all the components. also do i need the fuse panel and everything else under there. thanx for the help very appreciated

07-02-2009, 07:27 PM	#6 (permalink)
toyotabruce Registered User Join Date: Jun 2009 Posts: 3	thanks alot for the help