Need Hesco MPI Wiring Diagram

[Ralph]

I'm dealing with a 1993 Wrangler 4.0 EFI wiring harness. There's obviously a lot of stuff here that I won't need. I see that the harness for the Hesco or Mopar MPI kit contains significantly less wiring. Does anyone have a schematic for this, which I can use as a guide to trim way the fat from mine?

[sloop]

Ralph - I did my wiring with the original 1993 Wrangler harness. Do you have the power distribution center? I'll be glad to help you .. I can make a wiring diagram of how mine is hooked up if you want.. mine didn't come with the PDC so I had to do a good bit of wiring there

[Ralph]

I would appreciate that.

[sloop]

OK - let me know if you have the PDC or not.. if you do have it, do you understand it and is its wiring intact?

[Ralph]

What's the PDC (power distribution center)?

In my wiring harness, there are both the 60-pin and diagnostic connectors, and there is a complete box of relays and a big plug that looks to go directly to the firewall. I'd like to get rid of the relay panel and that big plug, so that I can wire the computer directly to switched ignition. Create a "stand alone" situation for the computer, then wire relays for the fuel pump and A/C, and perhaps later a separate relay for an electric fan.

[sloop]

The box of relays is the PDC. I didnt have that box so it took me awhile to figure out the wiring. I used basically this wiring diagram to figure out the relays for the ASD and fuel pump.

http://www.paradise.raleigh.nc.us/gallery/40jeepengine/aae?full=1

Tomorrow, in the daylight, I'll go look at my wiring and give some details .. maybe I can make a digram.

If you look in that diagram, there are only two input power wires you need to use.. the 10A hot in start and run (Wht/Yel to both ASD and fuel pump relays) and the 30A Red/Wht hot at all times.

When you are wiring the relays for ASD and fuel pump, don't deviate from the wiring shown on that diagram.. at first I tried directly grounding the relays as I had always done with headlight and accessory relays - but in this situation, it is best to let the computer control those grounds.

For the starter wiring, I kept my stock fender-mounted starter solenoid. I also used the 258 starter (and 258 flexplate). But, if you are using a 4.0L starter, you should be able to wire it to use the fender starter solenoid by wiring a jumper from the big + cable on it to the little terminal on it that engages the solenoid on the starter.