Mr. N, Chris Waterman, Sillyneck, H8Monday, etc...

Where the hell do I start with the wiring? I have the whole 87 Mark VII and there are wires everywhere and it is very difficult to get it all out. I don't even really know what I need to take out. I have looked at Mr. N and C. Waterman's websites and even though it has been very helpful, I am at a loss.

I figured I would start with the computer, so I took that out, but I can't seem to get the wires through the firewall either way. Then I figured I would take the wires out that were connected to the engine before I yanked it. That was a good idea, till I figured ALL the wires intermingle with evey loom, especially the big fat one that goes arount the whole engine compartment that has the headlight wiring.

Any ideas on where to get started? I have a bunch of books, but nothing helps me.

This is all going into my CJ7.

Go find an earlier mustang, I.E. 1993 for example and just pull the wiring harness from the engine computer thru the firewall to the engine, there will be a couple of wires intermingled with the car harness but FoMoCo sells a manual that street rodders use to decipher the wiring, the manual is five bucks and it explains everything. I used the 1993 mustang harness with my 5.0 implant and the manual was a great help. Hope this helps you out.

Booger

I pulled the whole harness out of my '86 Mustang - it's not that hard. You just have to be methodical about it. Disconnect each sensor and label it, and just work your way through the engine compartment. Tie wraps are your friend! I pulled the engine first - that gave me a lot more room to work. There's a couple wires that will go to the speed sensor, and the fuel pump solenoid, etc. that aren't in the engine compartment. Just make sure you label everything as you take it out because you'll be really confused later if you don't.

most people as ford swap questions in Ford Talk. try a seach there. I guarantee there are recent threads on it.

A factory manual from the car it came out of makes alot of sense...

and there is always searching outside of PBB:rolleyes:

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=ford+5.0+engine+swap&btnG=Google+Search

Booger- is a mustang harness different than the one I am trying to pull out?

withamc- Yea, that is what I started doing, but there are places where I just can't figure out where the wires go or where they are from. Like, there are two large looms that go into the cab of the car, one through the fire wall, one underneath the fender which I think is the computer end, but not sure.

Dan-H- Yea, I have the Lincoln manual and other Ford fuel injection books like I said before. I did check outside the PBB and actually have read all those sites before, but if you can find where the state how to MOST EFFICIENTLY remove a wiring harness I would be more impressed than your previous google search of Ford 5.0 engine swaps. :rolleyes:

One loom should go to the computer. The other one should go the dash - instrumentation, fuse block, etc.

The instrument one should be on the drivers side thou right? I am saying there are two on the passenger side. I will figure it out tomorrow one way or another though. Thanks withamc.

Originally posted by diiulio
if you can find where the state how to MOST EFFICIENTLY remove a wiring harness

since you seem to have read the whole internet ;) have you been here?

http://www.therangerstation.com/v8conversions.html

and read this?

http://www.therangerstation.com/EFI_Wiring.htm

yes. I have those printed out actually. Those are extremely useful. What I want to know is, are the Mark VII wiring harnesses different because the harnesses mix with each other and are wound together in many areas without connectors.

I know a sound like a jackass that can't unplug a wiring harness, but this is not the case. I have seen mustang engine bays and they do not seem as complicated as the Mark. The Mark is 100% electric. The brake booster has at least two connections, there is a bunch of wiring to the air suspension, etc...

I am looking for someone with Mark wiring harness specific experience.

I've pulled a harness from an 86 stang, 92 T-bird and 92 stang. Never a Lincoln though :(
1st, for the fire wall you need to pull the gasket out first, then the wire harness (noted you pulled the computer) is a very tight fit to get it threw. It took me 10 minutes on my first one once I had everything else cleared to pull it.
2nd. As it was said mark EVERYTHING! and take your time. Invest in some good tape and Permanent marker. Tape every connection and mark it what you think it is and mark it sequentially (i.e 1,2,3,4) so you can find the part later.
Study the Probst book, then find the same wires on your wiring harness. After you are sure you know every wire you need then determine which ones you don't need and pull them. I'd suggest pulling the entire loom off teh wires and put it back on later. If you have a camera take a lot of pictures! And I mean a lot! You should see how many I have of the harness just lying on the floor!

Good luck and post more question as the come up.

Ok diiulio - you have done your homework, even though it didn't sound that way at first.

here is another link. no help on getting the harness out but it is lincoln specific. even from an 87


http://www.coolcats.net/tech/advanced/mk50swap.html

That is an excellent site and I have talked with the guy who wrote that a few times when I was obtaining my Mark, he is very knowledgeable and extremely helpful.

Today hopefully I will get everything out and most of it deciphered. If I have any problems I will definitely ask away.

Thanks for being patient with this fuel injection virgin. This isn't as easy as my 360. That swap took me hours, this swap is going to take days and maybe even a couple of weeks.

I have e-mailed this to Chris W., but if any of you can help me decipher what these are, then pleas help. And let me suggest that you don't use a Mark VII wiring harness, it is confusing and don't know if it is going to work after all the shit I cut out of it. There are sensors for everything, anti-skid, air bag suspension, low level this, low level that, etc. I have been wrestling with the wiring for the past few days and it is a mess. The Mark VII is not self contained and is very intense. I have cut it down to what I think is necessary and will allow the computer to work with no problems, I hope. Well, it is time to splice into the Jeep harness and I have a few questions for you about Chris Watermans site. It is an 87 Mark VII speed density engine that is going into my 85 CJ7 that had a straight six.

My questions are from his site, half way down the page here: Chris W. site (http://www.bc4x4.com/tech/waterman/wiring.cfm)

Here it goes:

1. C4 Coolant temp sender goes to: R/W wire on black conncetor (cct39). First, what is cct? Second, I know the coolant temp sender wire on the Jeep, but the coolant temp sender from the 5.0L is two wires and goes directly to the computer through one connector, so where is the 5.0L wire?

2. When you say D5 battery power from ign switch goes to R/LG wire on grey connector (cct16), what wire is the R/LG? and what is the cct16? also, is the battery power from ign switch the red wire that goes to one side of the starter solenoid and also the alternator of the old system?

3. You say E4 battery power to lamps goes to black/orange fusible link to battery power. Why are you connecting anything to do with lamps? I thought that was all on the other side of the bulkhead.

4. G5 crank signal from ign sw to R/LB wire on grey connector cct32. What is the R/LB wire? cct32? What is the crank signal wire from the ignition switch? would that be the one that goes to the ignition module, coil and starter solenoid little prong?

5. I don't know what to do with the fuel pump and relay. I have the connectors from the fuel pump to the fuel relay and then to a fuel safety switch. There are four wires that I don't know what to do with. One from the pump, two or three from the relay and then one from the safety. I don't think I have a fuel pump power wire since it is an 85 CJ7.

If anybody has any tips or anything to add that will help me with this, please do.

Thanks a lot,

Jason

Anybody? I know it is long, but I figured too much detail is better than too little.

OK, I spent a few more hours this morning and have figured some of it out. I realize what the cct was, I had been using them, but didn't realize because some don't match up with the Mark VII.

Now, ONLY TWO QUESTIONS RIGHT NOW.

1. How do I wire up the fuel pump, fuel pump relay and safety switch? There are four wires that I don't know what to do with. One from the pump(two come out of the pump, one goes to the relay), two from the relay(four come out, one to the pump and one to the safety switch) and then one from the safety switch (two come out, but came from the relay).

2. start/run position power from the ignition switch that gets wired to HEGO power, alternator enable wire and to the TFI module. On the 89 Wrangler it is a Yellow wire that previously went to the ignition module and spliced to a wire with a resistor in it to the alternator, and then spliced again to the ignition coil with a resistor. On my 85 CJ7 I have two seperate wires that do this wiring, so does it matter which one I choose? I have a light blue that goes to the starter solenoid and then also the ignition module, then I have a brown wire that is wired to the alternator through a resistor. Does it matter?