explorer efi and centech wiring

[fummins97]

Trying to finish my wiring, using Garry's explorer efi harness with a new Centech main harness.
In the stock wiper harness, I've matched the black, white, red and blue wires to the Centech, but still have a black/blue wire left, any ideas what that one is for?

Anyone that has bought the dash matched tach, centech yellow tach sender wire goes to the signal on the tach? What wire do you attach to for ignition switch from tach, can it go to the "I" post on the starter solenoid?

In Garry's harness you need hot in run for many of the indicator lights and high idle switch, can I grab power for those from the Centech's "choke", "dist. mod." and/or "idle sol" wires since I have efi?

Thanks in advance

 

[DirtDonk]

... In the stock wiper harness, I've matched the black, white, red and blue wires to the Centech, but still have a black/blue wire left, any ideas what that one is for?

Do you mean a Black wire with blue stripe? Or that it's maybe black, or a very dark blue? If a striped wire, then that's not Centech then. Where is it located? Same branch as the other wiper wires? If so, it might just be a ground.
Got pics?

Anyone that has bought the dash matched tach, centech yellow tach sender wire goes to the signal on the tach?

Yes.

What wire do you attach to for ignition switch from tach, can it go to the "I" post on the starter solenoid?

Yes, but that's a long way away. I don't normally like connecting any other load to an ignition control wire, but with EFI you're not using that one anyway, so it's not going to hurt anything. In fact, you normally don't even connect that one, since it's unused.
You should have several (ok, at least a couple) unused 12v keyed power wires under the dash.
In a pinch, you could use the center lug of the ignition switch, or even the input side of the little IVR (instrument voltage regulator) on the back of the instrument cluster. Has to be the input side though, as the output is either pulsed or reduced voltage.

In Garry's harness you need hot in run for many of the indicator lights and high idle switch, can I grab power for those from the Centech's "choke", "dist. mod." and/or "idle sol" wires since I have efi?

Yes.
Verify each one is hot just in case, but yes, any of those should work.

Paul

 

[n59rob]

Along those same lines, I have a Centech harness and a Mustang EFI harness. Where do I pick up the temp and oil pressure leads from the EFI harness to connect to the Centech harness and dash gauges?

 

[904Bronco]

Along those same lines, I have a Centech harness and a Mustang EFI harness. Where do I pick up the temp and oil pressure leads from the EFI harness to connect to the Centech harness and dash gauges?

The Centech harness wires come out on the Pass side fender. There is a 3 wire GM weather pack connector there...

Not sure where your Ford wires terminate on your harness, should be easy to trace though.

-You can continue them (Orange and Blue wire) to the sending units and not use the Ford harness wires.
-Or you could connect the Ford harness wires at that point on the fender with the matching 3 wire GM weather pack connector.
-Or you could run the Ford wires directly to the gauge cluster inside, not using the Centech wires (but saving them for something else)
-Or any combination there of

 

[n59rob]

Thanks, that should do the trick!

 

[fummins97]

Do you mean a Black wire with blue stripe? Or that it's maybe black, or a very dark blue? If a striped wire, then that's not Centech then. Where is it located? Same branch as the other wiper wires? If so, it might just be a ground.
Got pics?



Yes.



Yes, but that's a long way away. I don't normally like connecting any other load to an ignition control wire, but with EFI you're not using that one anyway, so it's not going to hurt anything. In fact, you normally don't even connect that one, since it's unused.
You should have several (ok, at least a couple) unused 12v keyed power wires under the dash.
In a pinch, you could use the center lug of the ignition switch, or even the input side of the little IVR (instrument voltage regulator) on the back of the instrument cluster. Has to be the input side though, as the output is either pulsed or reduced voltage.



Yes.
Verify each one is hot just in case, but yes, any of those should work.

Paul

yes its a black wire, blue tracer, its in the original ford wiring from the windshield. Someone said it could be the map light wires. Thanks for the help Paul.

 

[DirtDonk]

Yep, Black w/blue is for the dome light if it's up through the windshield frame, and the map light if it's under the dash. You could call them both map lights of course, but using "dome" and "map" does help keep the two lights offered by Ford separate for discussion purposes.

Paul

 

[DirtDonk]

Thanks, that should do the trick!

Hold on a sec there Rob. Just so we're straight here, you do know that you will be using separate senders for EFI vs gauges, correct?

All the Centech knows is dash gauges. So just make sure you don't use any wires that are also sending signals to the ECM for water temp. Pretty sure that the oil pressure is not done for EFI purposes, but it might still be running through the computer at some point, depending on what harness you have.

Is it a Mustang harness from an actual donor car? Or one of the aftermarket harnesses?

Sorry if you and Doug were already on to all of that and I'm just on the wrong page.

Paul

 

[904Bronco]

Hold on a sec there Rob. Just so we're straight here, you do know that you will be using separate senders for EFI vs gauges, correct?

All the Centech knows is dash gauges. So just make sure you don't use any wires that are also sending signals to the ECM for water temp. Pretty sure that the oil pressure is not done for EFI purposes, but it might still be running through the computer at some point, depending on what harness you have.

Is it a Mustang harness from an actual donor car? Or one of the aftermarket harnesses?

Sorry if you and Doug were already on to all of that and I'm just on the wrong page.

Paul

I made the assumption that he was talking about the oil sending unit and temp sending unit for the gauges. NOT the ECT signal wires for the ECU.

Oil pressure is a white wire with a red strip
Coolant temp is a red wire with a white strip
ECT is Green with red strip/grey with red strip.

The oil and temp wire for the gauges terminate at the brown connector in the engine compartment... drivers side. (at least that is what I remember)

 

[n59rob]

Dirt,
We are talking the same. I just fired mine for the first time and had no gauges. I will need to connect senders to the Centech harness. Thanks for the clarification.
Robert

 

[DirtDonk]

Hey, congrats on the fireup!
Good luck on the gauges too.

Paul