Brought to you in part by:

Great deals on auto restoration supplies!

.


JC Whitney clearance center!

  Mustangsandmore Forums
  '79 to '93 -- The Fox Mustang
  AOD to T5 Conversion Electrical Problems

Post New Topic  Post A Reply
profile | register | preferences | faq | search

next newest topic | next oldest topic
Author Topic:   AOD to T5 Conversion Electrical Problems
GTRocks
Gearhead

Posts: 3631
From: Lusby, MD
Registered: Jun 99

posted 10-24-2002 12:11 PM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
Well, it's done!

The swap that is. Now I get to take care of the fallout. I have two problems that I need some ideas on.

First, it doesn't want to start. I'm thinking that somehow the neutral safety switch isn't being engaged somehow.

Second, the reverse lights are always on, regardless of what gear I'm in. Neutral, first, reverse, doesn't matter. I do have the switch on the tranny hooked up, so I'm not sure what the issue is.

Ironically, every time I've started it so far, it's been with the tranny in reverse! Maybe the two are connected somehow? I would think that if the clutch is in though, it wouldn't matter what gear you are in. Yes?


I did miss shifting so....I think I found 20 horses that I've been missing!!

IP: Logged

Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 10-24-2002 12:49 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The neutral saftey switch that screws into the AOD has the start and back up light circuit in it. Pull the switch out of your AOD and stick it back into the harness.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

IP: Logged

GTRocks
Gearhead

Posts: 3631
From: Lusby, MD
Registered: Jun 99

posted 10-24-2002 09:08 PM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
Well, I got a problem. I sold the AOD. I'm not sure I understand though...

Your saying that there is a connector still in the AOD that I need? The cable I have now has a 2-pin female that matches the 2-pin output on the T5. Does this connector just come out of the AOD and then fit between the two or something?

Sorry, I'm a little thick....this was my first major project!

IP: Logged

Rory McNeil
Gearhead

Posts: 1542
From: Surrey, B.C. Canada
Registered: Nov 2000

posted 10-25-2002 03:18 AM     Click Here to See the Profile for Rory McNeil   Click Here to Email Rory McNeil     Edit/Delete Message   Reply w/Quote
I don`t know what year car you have, but when I switched from a C4 to a T5 in my 78 Fairmont, there was a 4 wire plug that hooked into the neutral saftey switch. I just checked for power & what each terminal did, & wound up jumping the neutral safety plug together (78 Fairmont stick had no clutch saftey switch), but you could hook it to a saftey switch, if desired. The other 2 wires I hooked to a 88 Mustang T5 reverse light harness I got from a wrecking yard.

------------------
78 Fairmont 428 4 speed [email protected]
80 Fairmont 302 5 speed [email protected]
85 Mustang NHRA Stocker under construction, 302 5 speed
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd

IP: Logged

GTRocks
Gearhead

Posts: 3631
From: Lusby, MD
Registered: Jun 99

posted 10-25-2002 07:25 AM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
It's a '93. I went and got the cable from Ford that is supposed to be a '93 T5 cable. The one that came with the T5 didn't mate to the car. There's two pins that come off of the tranny, and the cable has 4 wires. Two of them are jumpered in the cable assembly itself.

IP: Logged

Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 10-31-2002 01:44 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Your former AOD harness has a 4 pin connector that pluged into the nuetral saftey/back up light switch. That switch resembles a sending unit and screwed into the trans.
As I see it, you have two options.
1) Do as Rory suggests and just jump the wires accross so you have no back up lights and the car starts anytime you hit the key.
Perfectly acceptable.
2)Locate your old AOD, or pirate from another AOD trans a nuetral safty switch and plug it back into the harness. You can either get one from a trans core at a junk yard, or possibly from a trans shop. You can also order a new one from a F/L/M dealer. They are about $40 or so new. (ouch)They are not serviced by the aftermarket or Motorcraft.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

IP: Logged

FISHTAIL
Gearhead

Posts: 599
From: Waldorf MD USA
Registered: Sep 2000

posted 10-31-2002 11:14 PM     Click Here to See the Profile for FISHTAIL   Click Here to Email FISHTAIL     Edit/Delete Message   Reply w/Quote
Dave, did you solve this problem yet? Are you planning on attending WW3 at MIR this year? Nov10th import vs domestic race

------------------
-FISHTAIL
92GT "The Ghetto Sled"
CMPS major @ University of MD college park
Best ET/MPH thus far: 14.40/100.67mph....damn wheel spin.
VP and co-founder of CMTC www.cmntc.com

IP: Logged

GTRocks
Gearhead

Posts: 3631
From: Lusby, MD
Registered: Jun 99

posted 11-03-2002 01:03 PM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
No, I haven't fishtail. Seems I'll have to track down a neutral safety switch and an AOD wiring harness to be able to do it. I contacted the guy I sold the stuff to, and he needs both. Poor planning on my part!

Didn't know about the event at MIR. I might be able to arrange that. I'm assuming you are going? I'll have to work on the wife!

The thing that I really don't get about all this, is that I bought the T5 wiring harness from '93 from Ford. If I really need to use the AOD wiring harness, then why does Ford even sell a T5 harness? Is the computer different or something? The output on the T5 is just a 2-pin connector, which mated perfectly with the '93 T5 wiring harness. I thought I was good to go....sigh.

Thanks for your help guys, I really do appreciate it!

[This message has been edited by GTRocks (edited 11-03-2002).]

IP: Logged

Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 11-03-2002 01:20 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The harness is the same. There are piggy backs that connect about a foot or so back in the harness that are different between a stick and automatic.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

IP: Logged

GTRocks
Gearhead

Posts: 3631
From: Lusby, MD
Registered: Jun 99

posted 11-03-2002 08:08 PM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
The harness is the same. There are piggy backs that connect about a foot or so back in the harness that are different between a stick and automatic.


Ok, my terminology may be off. Let me see if I have this straight:

There is a foot long (or thereabouts) wire bundle that connects to the tranny of choice, and then connects to the car (I'm assuming the car-side of this connector is considered the wiring harness?). This foot long bundle (4 wires, I think) is called a piggyback? This foot long wire set is what's different between the two. If I understand you correctly Alex (not a given), I need to pull the 2-pin switch out of the T5 and put the one from the AOD into the T5. Additionally, I need to use the AOD piggyback, as opposed to the one for the T5. If that's right, my underlying confusion still exists. Ford does make a piggyback for the T5 and the tranny side has a 2-pin female connector, which mates perfectly to the 2-pin male switch that's currently in my T5. So if I need to pull out the 2-pin male switch in the T5 tranny, and replace it and the T5 piggyback with those from the AOD, why did Ford make a T5 piggyback? In my novice mind, I have the T5 switch, and the T5 piggyback installed so everything should work correctly. This obviously isn't the case, since they're not working right.

Sorry I'm so thick!

IP: Logged

GTRocks
Gearhead

Posts: 3631
From: Lusby, MD
Registered: Jun 99

posted 11-07-2002 09:53 PM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
Just for a little closure:

Ed (ragtopjr) and I were AIMing the today and I was walking him through all of the issues and he had an idea that I hadn't thought of. Since there are 4 wires on the pigtail, and 2 of the 4 are jumpered, perhaps they got connected backwards.

In theory, 2 of the wires should have been for the neutral safety switch, which would now be jumpered. The other 2 wires would be for the reverse lights. Since the reverse lights were always on, regardless of anything, it would make sense that they were jumpered. It would also make sense that the neutral safety switch was getting its signal only when the car was in reverse, which would explain why I could only start the car in reverse.

Well, I put that theory to the test tonight. It really pained me to hack away at the factory made (!) pigtail, and splice it all up, but I had to do it. I plugged it back together and she works like a champ!

Many thanks to Ed!!!

Now the battery is dead....sigh....if it's not one thing....

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2005, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[Posting Pictures]

[About M&M][Acronyms][Calendar][Chat][Classifieds] [Members' Pics]

[M&M Conventions] [M&M Mug Shots]

[ Mustangsandmore.com Bookstore] [ Smokin' Fords] [Tech Articles]