ECU Connectors & Terminals - Holley EFI

[andrewb70]

ProWire is now offering back shells and boot kits for the ECU connectors: https://www.prowireusa.com/holley-do...onnectors.html Andrew

[Bossbill]

I don't have my Ford Terminator X system yet, but I'm preparing the dash for a new wire harness, hidden A/C routing (inner fender), etc. Ford has already supplied me with a 1 3/8" x 3" firewall knockout in a somewhat convenient spot behind the LH head. Will all the engine connectors make it through this knockout?

[andrewb70]

I would think so. Andrew

[Rdf1]

I was able to run the J1A & J1B connectors through a 1-5/8" hole.

[Bossbill]

Thanks for the verification. With a bit of jiggling it should be able to make it through. The '65-'68 Mustangs all have this knockout. This firewall plug can be modified to fit this factory knock-out and the harness:

[Danny Cabral]

TIP: I relocated the main power harness fuse holder about a foot further away from the ECU connector, so it's located in the engine compartment side of the firewall grommet for easy access. I did this by simply extending the ECU end of the main power harness. Of course, the Holley EFI main harness & main power harness are both easily routed through the firewall hole for the rubber grommet. Obviously, the center hole of the rubber firewall grommet must be enlarged, and the grommet cut on one side for removal & reinstallation. (If you prefer to modify a new one: LINK.)
https://forums.holley.com/showthread...464#post100464 (Related Ford 5.0L Fox Mustang - Holley HP/Dominator EFI Installation Post)

On my '92 Ford Fox Mustang, I fit everything (OEM EEC & Holley EFI main harness) through the rubber firewall grommet (enlarged center hole), which looks similar to yours: LINK.

[Bossbill]

Thanks for the tip, Danny. Although I try and search before asking, there's just so much information and I must have missed that. I'll buy both since I also have to route a few engine sensors and maybe the small hole will do that.
I can see that before I go much further I need to have the Terminator PCM and harness in-hand. There are so many things that want the same space under the dash of this car. I need to have all of the components in place to see where they route.