Wiring Harness difference 93-94.

jclose11

Member
Jul 23, 2008
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4
18
I need some help. What is the difference between the wiring harness 1993 and 1994 mustang gt.. I just bought a megasquirt computer for up to a 1993 mustang , but I have a feeling its a 1994 wiring harness in my car the mass air plug is different then the stock fox mustangs I've had in the past. I'm hoping I can still use the Megasquirt in my car.
 
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Mustang5L5

This is a big reason why I pulled it out
Mod Dude
Feb 18, 2001
31,345
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Massachusetts
Mass air plug is the same. I actually run a 94-95 MAF on my car.

Quick way to tell is BAP/MAP plug. The sn95 cars don’t have it as the ECU has the sensor internally

Pics of the plug?
 

Dan02gt

10 Year Member
Mar 2, 2003
594
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Greenville, NC
I would find it hard to believe someone used a '94 harness in a '93. They are way different. The distributor plug is different because of the remote TFI, the location and type of a lot of the connectors are different. It has a CCRM to run the electric fan and AC. There are no salt and pepper 10-pin connectors, but there is a bolt down junction on the firewall to allow the engine part of the harness to connect to the rest of the harness.
 

Mustang5L5

This is a big reason why I pulled it out
Mod Dude
Feb 18, 2001
31,345
7,602
224
Massachusetts
It's fox wiring harness.

It has a 1996-02 4.6L 6-wire MAF wired in. You also have 24# injectors. You can still MS it but just need to ID the MAF transfer function for that particular MAF or change it to a known unit

What tune/chip/ecu is being used now to make that all run. If it runs well, must have some sort of custom tune on it now
 

jclose11

Member
Jul 23, 2008
33
4
18
It's fox wiring harness.

It has a 1996-02 4.6L 6-wire MAF wired in. You also have 24# injectors. You can still MS it but just need to ID the MAF transfer function for that particular MAF or change it to a known unit

What tune/chip/ecu is being used now to make that all run. If it runs well, must have some sort of custom tune on it now
I have no Idea just picked the car up, and the guy knew nothing about it.
 

Blown88GT

Founding Member
Nov 13, 1999
1,592
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124
Palm Beach Gardens, FL
I never heard of that ECU. Looks like they are out of business (domain name is for sale).
If you don't have the tuning software for it, good reason to swap ECU's.
Found some info here: https://forums.corral.net/forums/94-95-tech/1128765-speed-brain-pcm.html
Go to our Digital Self Tuning sub-forum & ask Steve (Mod & Megasquirt guru)
 

Blown88GT

Founding Member
Nov 13, 1999
1,592
282
124
Palm Beach Gardens, FL
OP installed it today.