ALDL wires?

[NEK5]

The harness in question is an 89 EFI harness. Are these the wires that go to the ALDL plug on the other side of the cab? If they are, can I just hook the plug up to these wires, therefore having the ALDL port in the middle, or on the passenger side of the dash?

If not, what are they?

The wires in question are in the top/right of picture:

TIA guys!

While we`re on the wiring topic, on the same harness, the oxygen sensor plug has 1 purple wire going to it, as well as a round, single plug?

 

[dyeager535]

You'll need to look at a wiring diagram unless someone here can look at those and be dead on.

To me, it looks like you might have a 12V feed from the fuse panel sitting there, might have two or three. (injectors?)

If I had an '89 manual I'd post up what the wires to the ALDL are. My '91 is probably close, but you don't want to guess here. Then again, with a continuity tester, if I give you the colors/pin locations, you could go through and verify whether they are the same or not.

 

[Thunder]

I looked at my ALDL on my 89 K5. It has 5 wires. Tan, Orange, White, brown, Black/white stripe.

 

[NEK5]

Thanks Thunder! I`m going to head back up to the dining room (thats where my harness is ) and see if I can`t label some more stuff....then start removing whats not needed.

 

[NEK5]

Ok. Here`s the wires that come off that plug:
Brown, Brown w/ white stripe, orange, orange w/ black stripe, black w/ white stripe, white w/ black stripe.

If I`m not mistaken, these are the wires that the PO said that he cut, that went to/towards the fuseblock when he removed it. I will go check and see if I can find the ALDL port on the other part of the harness (I`m working with the engine side right now) and see what wires go to it.

Thanks for all your help guys, especially Dorian, Thunder, and even know he hasn`t replyed here at all, ryoken.

 

[NEK5]

If this is the ALDL port, which I`m almost positive it is, then here`s the wires I see on it: Tan w/ black strip, orange, brown, white w/ black stripe, black w/ white strip.

If these were the wires that the PO said were cut that went to/towards the fuseblock, I need to try and track them down on that side of the harness. Shouldn`t be too hard to find 6 wires that were cut off, and match the 6 I see here. I`ll check into it more tomorrow morning, and update as I find stuff out. I have, however found the wire for the knock sensor, by tracing it from the ESC. Still alot more things to identify, but its getting there, slowly but surely...

 

[NEK5]

Ok, well I found out where the wires went. They were going towards the fuseblock, but I`m not exactly sure if they went there, or to various plugs. Since I`m only using anything motor/efi/computer related from this harness, how can I go about seperating everything I need. I have the motor side of the harness, and then the inside fuseblock, and most of the wiring. Everything engine related is there, according to the PO. Thanks in advance guys!

 

[dyeager535]

I don't think you'll have anything in that harness that ISN'T EFI related. I don't recall removing anything from mine there.

 

[NEK5]

I don't think you'll have anything in that harness that ISN'T EFI related. I don't recall removing anything from mine there.

I think you`re thinking of the motor wiring. What I meant was what wiring I had to remove from the rest of the harness, like the fuseblock, and whatever wires that came through the firewall, that were part of the motor wiring.

EDIT: Pretty much what I`m trying to do is seperate everything EFI related from the 89 harness. The 89 harness is a mess, and I`d like to start with something fresh, all labled, and easy to install. So I`m going to be combining the EFI harness with an 18 circuit universal, so I need to know what I need to keep from the 89 harness. Any tips? I`m wondering what needs to be kept that went through the plug on the firewall. I`m also asumming the 6 wires that were cut from the ECM going to the fuseblock are needed. Is there an easy way to trace all these wires down, and find out everything I need to keep? I have a bunch of diagrams, including an ECM pinout.

 

[dyeager535]

Wire colors *typically* didn't change through a run, an ECM pinout should have the wiring color if factory, so if you've got a cut end, find a plug with that color on it, and test it with a continuity checker. (multimeter should have one) If multiple connectors have the same color, like orange, check all of them, they are likely spliced somewhere.

Anything that went through the hole in the firewall on the passenger side should be EFI related. Only EFI related piece I can think of on the drivers side firewall plug is the fuel pump power wire, everything else(?) passenger side.

 

[NEK5]

Wire colors *typically* didn't change through a run, an ECM pinout should have the wiring color if factory, so if you've got a cut end, find a plug with that color on it, and test it with a continuity checker. (multimeter should have one) If multiple connectors have the same color, like orange, check all of them, they are likely spliced somewhere.

Anything that went through the hole in the firewall on the passenger side should be EFI related. Only EFI related piece I can think of on the drivers side firewall plug is the fuel pump power wire, everything else(?) passenger side.

Ok, I would really like to start seperating all of it. Let me see if I can explain this, and have it make sense. The plug that went into the firewall for the motor wiring, where it plugs in to the firewall, you can see all the wires coming off the back of it. Now, the other plug is the other stuff, lights, etc. Is it alright to go ahead and cut all of those out of the way from the back of the plug, so that it makes it easier to pull all the wires out.

Also, from what it looks like, all the wires for the sensors for the gauges come through that plug as well. Is that right?

 

[NEK5]

Only EFI related piece I can think of on the drivers side firewall plug is the fuel pump power wire, everything else(?) passenger side.

So the rest of it is for the senders/sensors for the gauges, ie water temp, oil pressure, fuel, etc?

 

[dyeager535]

Should be. You'll still want to confirm each wire of course, but those are the only ones I can think of. IIRC, even one of the alternator wires is tied into the fuse panel plug on those later ones. It is on my Camaro wiring.

You want to be doubly and triply sure before you cut or remove anything, I thought I could remove some stuff (I think it was the AIR solenoid wiring) however it ended up that the power for that was spliced with others, if I would have removed it before double checking myself, when I went to pull the cut wire I would have realized my mistake.

 

[NEK5]

Should be. You'll still want to confirm each wire of course, but those are the only ones I can think of. IIRC, even one of the alternator wires is tied into the fuse panel plug on those later ones. It is on my Camaro wiring.

You want to be doubly and triply sure before you cut or remove anything, I thought I could remove some stuff (I think it was the AIR solenoid wiring) however it ended up that the power for that was spliced with others, if I would have removed it before double checking myself, when I went to pull the cut wire I would have realized my mistake.

So visually trace everything out I need, make sure I know each wire I`m cutting is what I need, before I cut anything...makes sense Just need to find out exactly where all the wires go from that plug, as well as where those 6 wires cut from the ECM go.

Thanks Dorian.

 

[dyeager535]

Now that I think about it, you might also have a fuel pump diagnostic wire on the ALDL connector, which also may come through the drivers side.

I'm not 100% on this, but I believe some (all?) EFI GM setups this vintage have a fuel pump wire on the ALDL that you can jumper to trigger the relay.

I'm somewhat curious on this one, never think to look when I've got my wiring manual(s) sitting in front of me.

 

[Thunder]

This may help it is the pin out for your 747 ecm with wire colors.
A1- Fuel Pump Relay Dark Green/White A1
A2- N/A
A3- N/A
A4- EGR Control Gray A11
A5- SES Control Brown/White A7
A6- IGN ECM Fuse Pink/Black C1
A7- TCC Control Tan /Black A4
A8- Serial Data Orange C11
A9- Diag. Terminal White/Black D6
A10- Speed Sensor Signal Brown B11
A11- Sensor Ground Purple or Black D2
A12- System Ground Black/White C2

B1- Battery 12V Orange
B2- Fuel Pump Signal Tan/White
B3- EST Ref Low Black/Red D13
B4- N/A
B5- EST Ref Hi Purple/White D14
B6- N/A
B7- ESC Signal Blk or Yel/Blk or Yel/Red
B8- A/C Signal Dark Green B12
B9- N/A
B10- Park/Neutral Safety Orange/Black
B11- N/A
B12- N/A

C1- N/A
C2- EAC Solenoid Brown
C3- IAC B Low Lt Green/Black C8
C4- IAC B Hi Lt Green/White C9
C5- IAC A Hi Lt Blue/White C6
C6- IAC A Low Lt Blue/Black C7
C7- Hi Gear Switch Lt Blue B5
C8- N/A
C9- Crank Signal Purple/White
C10- Coolant Temp Yellow D16
C11- MAP Lt Green C10
C12- N/A
C13- TPS Signal Dark Blue C5
C14- 5 Volt Ref Grey D4
C15- N/A
C16- 12 Volt Battery Orange D1

D1- System Ground Black/White C2
D2- Sensor Ground Black/Red or Purple/Black D3
D3- N/A
D4- EST Control White D11
D5- EST Bypass Tan/Black D12
D6- O2 Ground Tan C13
D7- O2 Sensor Purple C14
D8-D13 N/A
D14- Injector B Lt green C15
D15- N/A
D16- Injector A Blue C16
__________________

 

[NEK5]

Thanks Thunder!

 

[fatbob]

Here is a pretty good thread I used to add a stock TBI harness to my project.

http://www.pirate4x4.com/forum/showthread.php?t=432269&highlight=wiring

Just scroll down to the aldl post and you should find what you need.

 

[NEK5]

Here is a pretty good thread I used to add a stock TBI harness to my project.

http://www.pirate4x4.com/forum/showthread.php?t=432269&highlight=wiring

Just scroll down to the aldl post and you should find what you need.

Awesome! I think I may go ahead and do just what you do, seperate everything, all the way back to the ECM.

Is this what was left of the plug that plugged into the firewall?

What were all the wires that came through that plug? all for the sensors and gauges, etc?

EDIT: I also see alot of people said they removed the alternator wiring, the oil pressure sending unit, and the temp sending unit, to make it "simplified". If you remove the alt. wiring, how does the alt. hook up? For the oil presser and temp sending units, do they remove those just because they most likely will run aftermarket gauges with their own sending units?

 

[NEK5]

Ok guys, here we go. I traced back the 6 wires that were cut coming off the ECM. First. The orange wire, and white w/ black stripe wire went straight to the ALDL port.

The brown w/ white stripe went to this big white plug:

The black w/ white stripe wire went to a junction, then two all three of these plugs, and to the ALDL port.(the black plug on the left also has an orange w/ black stripe wire that is one of the wires coming off the ECM:

The brown wire went to this white plug: (which is also one of the plugs the black w/ white striped wire went to)

Now, aside from those 6 wires, there were two more wires coming from ALDL that I didn`t know where they went, the tan w/ black stripe, and the brown wire, and they both went to the bottom half on the back of this plug, which is where the motor wiring harness plugs in: