asalian

So as some my know im doing an ls1 swap in my 74 vette. Its been a almost a year and ive come down to doing the wireing harness. I got a 5.3 truck harness but after putting that on i realize it super messy and i have a lot of extra plugs. what do you guys who have done the swap thing about a ebay harness? i was looking at this one.

http://cgi.ebay.com/ebaymotors/ws/eB...TQ:MOTORS:1123

theres also another guy on ebay that will charge 325 to take my old harness to change it. to what the above seller is doing.

what would be my best route? anyone know a cheaper solution?

boondiggys

iTrader: (165)

you can use an f body harness--they need only a few of the pink wires hooked up to power and the car will run---it's super simple to figure out--

72_nova

iTrader: (1)

the guy on ebay for $325...sounds like the route I took. I don't have my car fired up yet, but it's close. the guy I used charged me $325 to rework the harness, added 4 relays for fans, fuel pump and Ign. for the money I like it, pretty quick turn around responded to emails in less than 24 hours, assuming it works when I go to fire the engine I think it was a good deal. But the next swap I do I will try my hand at reworking my own!!

EDIT: and he removed vats and emission stuff from the ECM for me as well

bjamick

iTrader: (31)

The 5.3 harness will work just fine. I'm using on for my swap. All you have to do do is go through the PCM and remove what you won't use. The rest will be just removing connectors and adding power to pink and orange wires. Then just running gauges.

psiconversion

iTrader: (5)

Where are you planning on putting the PCM and fuses?

asalian

thanks for the reply guys

since the harness i have is a 5.3 with the truck injector plugs and alt plug im not to sure what to do exactly. does anyone have a wiring diagram for the 5.3 and the 5.7? so i can compare the 2

bjamick

iTrader: (31)

You have to go to the junkyard and grab some injector connectors off of a 96+ GM car. Then just solder them onto the 5.3 harness.

asalian

so any fbody wiring harness would work? even a 98? i doesnt matter if the motor is a 5.3 does it?

bjamick

iTrader: (31)

Get 99-02 f-body harness.

2xLS3

iTrader: (3)

Are you running the LS1 style intake or the truck one?
If you're running the truck one, stick with the truck harness and rework it.
If you're running the LS1 intake, it might be less work to start with the F-body harness.
Since you're going to rework the harness anyway, you could start with the 98 one and repin it for the 99 -2002 style PCM


What are you using for a tranny?
Did you move the motor forward to give some clearance between the head and firewall?
I was tempted to do a Gen3 swap in to my 79, but decided it would be a lot less work to put a Gen 1 Ramjet motor in it

kevindglenn

Seems like the 5.3 harness will do the trick. You'll have to go through the PCM and remove whatever you won't use. The rest will be just removing connectors and adding power to pink and orange wires, and of course running gauges.

Jimbo1367

I would recommend using PSIconvertion if you want to get it done on the cheap side. Heard alot of good things about them and very good quaility too. Just my .02

psiconversion

iTrader: (5)

We can provide a plug and play harness for any LS engine with any transmission and any intake combination. Give us a call at 732-691-6531 or PM for a quote.

Jon
PSI

asalian

Okie so im using my a truck harness and got ls1 style injector plugs from a camaro/ta what ecm should i use?

psiconversion

iTrader: (5)

You can use any PCM that can support drive by cable. If you are using the car injectors, you can update the truck tune. What MAF are you using? Car and Truck values are different.

Jon
PSI

psiconversion

iTrader: (5)

You can use any PCM that can support drive by cable. If you are using the car injectors, you can update the truck tune. What MAF are you using? Car and Truck values are different.

Jon
PSI

asalian

Im using a drive by cable. car injectors, i havent found an ecm yet. The cam was changed out to and i put a 02 z06 stock cam and lifter and rockers in it. i havent replaced the valve spring. should i find a corvette ecm or a stock 5.3 one from a truck?

psiconversion

iTrader: (5)

You can find any 411 red/blue PCM and it will support either drive by cable or drive by wire.

Jon
PSI

99VetteFRC

I have schematics for both 02 ls1 and 03 5.3. Pm me your email and I will send them to you. I'm using the harness that came with my 4.8 (sam as 5.3 and 6.0) and mine works just fine, on the stand. Wasn't hard to rewire the harness.

http://www.youtube.com/watch?v=a0AR_...2&feature=plcp

asalian

Other than the ls1 style injectors what other plugs do i need to swap out? im using a corvette style accessory. and camaro style oil pan. with an camaro ss intake. i dont have a maf yet could i use a truck maf or should i keep with a camaro maf?