Wiring for Crate LS3

[CapSS92]

I made my own harness from the donor LS3 car but I am now switching to Holley. I got tired of having to send off the ECM every time I wanted to change anything and I'm not technical enough to do my own programming. I am in the process of installing a Holley Terminator X for a friend of mine also and I like the Holley stuff. So far it seems to be well built and setting up the software was pretty easy. Most of questions have already been addressed on the Holley EFI forum. I've always been a fan of using GM parts but the programming is what convinced me to change. I'm still keeping the old harness and ECM though. Just in case lol.

Alex

[XLexusTech]

PSI conversions.. Really great customer support.. and well made

https://www.psiconversion.com/?gclid...SAAEgK15PD_BwE

[dontlifttoshift]

Speartech would be my first choice for easy button wiring. The GM fuse panel is huge, the fan control strategy is beyond dumb, and I can't believe they actually still use corrugated wire loom.

TerminatorX if you know what you are doing or would like to be more involved with the install.

[Ketzer]

I used Speartech for the wifes FJ40 LS swap, needed a couple specific add-ons and they were very easy to deal with. Also no problem after the sale when I called with a couple noob questions during install.

I used Hotwire Auto on my Gen3 hemi project and Chris's stuff is really nice also. Hemi swaps are a little more in depth than LS and he walked me through every bit of it. He also does LS.


Jeff-

[Sheck44]

I have used PSI for all my projects thus far and have had no issues
Like Jeff though, I am going to try out Speartech on the next build as recommended by my engine guy and tuner

Cheers
Steve