Chevy Tri Five Forum banner
1 - 15 of 15 Posts

·
Registered
Joined
·
488 Posts
Discussion Starter · #1 ·
so has anyone out there ever built a stand alone wire harness, i just can't beleave what some are asking to get one made , i have a 2004 5.3 vortec out of a silverado P/U.:bowtier:
 

·
LS Tech and Moderator
Joined
·
11,350 Posts
so has anyone out there ever built a stand alone wire harness, i just can't beleave what some are asking to get one made , i have a 2004 5.3 vortec out of a silverado P/U.:bowtier:
Are you looking to get a harness reworked you have?

Or you need a standalone harness.

I sell reworked harness's. Mine are $750 for a standalone harness with a custom tuned PCM.

That doesn't include the TCM or pedal assy for the DBW Thottle body.
 

·
Registered
Joined
·
37,965 Posts
If you understand the engine functions, and understand electricity and wiring diagrams, you can convert a stock harness yourself. You'll need a factory wiring diagram; best place to get it is a factory service manual because it's got so much more that you can use. You'll also be well off to get the underhood harness and the instrument panel harness from the donor, as you'll need some of these pieces. You may want to go one step further and get the re-programming software and cable.

The cost beyond the manual and s/w is really only going to be some wire and connectors, and this is minimized by getting the extra harnesses.

The bonus of this is that done right, you'll have the knowledge and tools to maintain or modify what you have.

It's not for everyone, but certainly a good option for some.
 

·
Registered
Joined
·
6,544 Posts
I use Alldata for the yr of the vehicle/engine. About $35.00, and you have a complete, printable manual..
www.alldatadiy.com
We use EFILIVE for tuning/diagnostics.. Not cheap, but is the best we've found.
www.efilive.com

Fantastic support. A visit to the site, and a free download, will show you the system, and how it works.
 

·
Registered
Joined
·
488 Posts
Discussion Starter · #6 ·
If you understand the engine functions, and understand electricity and wiring diagrams, you can convert a stock harness yourself. You'll need a factory wiring diagram; best place to get it is a factory service manual because it's got so much more that you can use. You'll also be well off to get the underhood harness and the instrument panel harness from the donor, as you'll need some of these pieces. You may want to go one step further and get the re-programming software and cable.

The cost beyond the manual and s/w is really only going to be some wire and connectors, and this is minimized by getting the extra harnesses.

The bonus of this is that done right, you'll have the knowledge and tools to maintain or modify what you have.

It's not for everyone, but certainly a good option for some.
i have a complete donor vehicle so i have it all, i will get looking around and see if this is what i want to take on, thank you.
 

·
Registered
Joined
·
488 Posts
Discussion Starter · #7 ·
I use Alldata for the yr of the vehicle/engine. About $35.00, and you have a complete, printable manual..
www.alldatadiy.com
We use EFILIVE for tuning/diagnostics.. Not cheap, but is the best we've found.
www.efilive.com

Fantastic support. A visit to the site, and a free download, will show you the system, and how it works.
did you build your harness ? i'm not much for the wiring but have friends that could take this on with the correct diagrams.
 

·
Registered
Joined
·
488 Posts
Discussion Starter · #8 ·
Are you looking to get a harness reworked you have?

Or you need a standalone harness.

I sell reworked harness's. Mine are $750 for a standalone harness with a custom tuned PCM.

That doesn't include the TCM or pedal assy for the DBW Thottle body.
i have a complete donor vehicle,
 

·
Registered
Joined
·
865 Posts
LS harness

If you have a servicable LS wiring harness the mod's are not to difficult.

I modified my harness when we installed my LS-1 in my '56 3 years ago.

But, it was very simple and clear for me. But I'm an
Electrical / Computer Engineer. So, I see the complexity from a
different point of view.


Some hints.

When you remove the engine, remove all of the connectors not connected
to the engine [lable them] and leave the PCM harnes on the engine.

Remove the PCM computer FIRST, wrap it in Aluminum Foil !!

clean the engine and wiring - no harsh solvents

identify all of the engine sensors. Most likely you will remove the EGR,
secondary Oxygen Sensors and so on.

Place a tag on each sensor, include the ones you will delete. I used blue
ink for the keepers, and red for the ones to delete.

You will have several wiring connectors from the PCM that do not plug
into the engine. Mark them when you remove them !!

Example The Tremic 6 Speed has a handy Reverse lock out solenoid.

You must know which trans that you will use before a PCM harness mod.
Mark at S&P Performance can re-program your PCM for you combo, axle
ratio, and delete the unused sensors.

There will other connectors for the radiator fans, A/C, Radio I/O, Cruise,,
yada yada.... Lable them when you remove them. It will save you must time and .....

Now you will need perfect schematics, try ALL Data online manual. You
can print or save any info !!

http://www.alldatadiy.com/?gclid=CKf-gsrEtaUCFRhzgwods3DcXw


I think it's a $20 or so for the year subcription. If you go this route
buy the subcription for your doner vehicle.
It's a great resourse as they have everything online. Where are the
sensors, what do they look like, how to test,, on and on....

They have great data on line with free teck support and will fax you
doc's if not avaible online.

If you not the advanced Teck type, get someone to mod the Harness.
Or send me an email, I'll try get you hooked up. Or if we are not
swamped, we can mod the harness for you. I can also mod up you
a schematic for you and instruct you what and were to cut the wiring.

We can also give a little Teck support on How To mod the harness,
soldering, shrink tubing [marine with glue], sensors to keep and so on....
\
ALSO, don't cut the wiring on the harness !!! And do not modify any
of the ground wiring on the harness ! Very important.......

Enjoy. You will be happy when it's done !!

Michael
Cypher Enginering
 

·
Registered
Joined
·
3,647 Posts
Nice thread. Just what I needed this evening. I didn't ev en think about using the harness I have wiith the Vette. I used a Camaro harness for the TPI I have before this LS1. Wasn't too hard at all. My son just did an LS1 harness for his 260Z project.
Now I need to find a body/ chassis harness or should I use the harness from the Vette? I bet I'd strip out more than I use:rolleyes:
 

·
Registered
Joined
·
6,544 Posts
4 fuses

thank you, thank you, great info, and i will use the original fuse box from under the hood.:tu
are all you need in a stand alone..Why deal w/ that huge oem box, when a 4 slot fuse holder will do the job??
Need a pic? I'll take 1 of the block on my Howell harness.
 

·
Registered
Joined
·
37,965 Posts
I used the underhood box from my LT1 donor because I had a use for all the relay slots, and I did use about half the fuse slots. I suppose those boxes vary from car to car, but not by a whole lot.
 

·
LS Tech and Moderator
Joined
·
11,350 Posts
are all you need in a stand alone..Why deal w/ that huge oem box, when a 4 slot fuse holder will do the job??
Need a pic? I'll take 1 of the block on my Howell harness.
The nice thing about the under hood fuse box is it gives you lots of options for extra fuses and relays. Its not that big you can cut the bottom plastic down and it'll fit in the fender well.

Although it still looks hideous to some!:D
 
1 - 15 of 15 Posts
Top