I'm not going to be a ton of help here. I swapped my g60 corrado probably 12 years ago. The single pin grey wire I don't think you need to change the connector, I think the one that is on it will still plug in. The two heavy red wires with the black plug, I believe this is the connector that needs a jumper. I don't remember what it is for, but I am certain I had one connector in my swap that I have a 30 amp fuse stuck into the connector and it wouldn't start without it. There used to be an excellent diy vr6 swap thread with pictures and detailed instructions. I'm having a hard time finding it though. I'm not home, but I could look this weekend and see if I can locate these connectors and see if they're plugged in. My mfa does work, and I don't have AC in the car either.

 

I'm assuming you probably already know about this website, but this may point you in the right direction on the cluster wire.

Central Electric 2 Cluster

They only list 7 wires as going to single connectors on the cluster harness - trunk unlocked, brake pad wear indicator, left turn signal indicator, right turn signal indicator, mpg signal for mfa, transmission gear display, and trunk open. Sounds like it won't be critical either way.

 

More helpful than ya might think. Dropped the VR6 harness through the firewall yesterday. The grey wire/white stripe brown plug is I believe is for OBD port and it’s one of the remaining stragglers I have to sort out and figure out if I need to edit the plug form factor. Gotta search through the rats nest for where it plugs in though [emoji23] And yes, I found another forum about the black connector/red cables that said similar- needs a fuse, thereby effectively bypassing the alarm. Which I’m cool with. That forum said 15amp, you say 30, I’ll prolly go with whatever I have on hand. Alarm bypass also I think solves that 4pin yellow, 6 pin red form factor issue since those are related to turn signal flashers for alarm.

Can’t find anything related to the yellow plug with red/black stripe on the gauge cluster harness, either in Bentley or forums. And the A2resources page has been helpful but doesn’t list it either. I may just leave it unplugged and run tests after I drop in the VR6 and wire up the bay.

If ya happen to come across that VR6 swap thread I’d love to look it over. Really appreciate your insight bro!


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Some more electrical/wiring links (That might come handy):
1) B3 and B4 Passat Central Electric 2 [CE2] wiring (at back of fuse panel) - izzo @ google
2) List of fuses and relays - B3 and B4 Passats - izzo @ google
3) Motronic Pinout
4) Electrical / ECU - izzo @ google

 

Update. Everything I can plug into the fuse/relay panel and most secondary individual connectors that mate up in the dash outside the panel are in, meaning I’m pretty sure I’m ready to at least do some electrical tests in accessory position once I drop in the VR6 and finish wiring up the bay. Then if nothing seems to be exploding I’ll try turning ‘er over.

One thing I’m not sure about- Connector T plug for the relay panel is completely MIA. Bentley says it’s a 2 pin green connecter but doesn’t list a function like the others. May have never had it to begin with, maybe it’s a diesel thing or some function neither ABA’s or VR6’s have. Insight appreciated.

The remaining master checklist of things that don’t have a home and are still a little bit of a question mark-

These two one-pins. Yellow connector is red/black stripe. Blue connector is red. They are part of the VR6 gauge loom. The ABA gauge cluster loom has the same blue connector so it must go somewhere, probably a female that isn’t blue. I should’ve labeled better [emoji58]

These two black connecters. One is a 3 pin with grey/white, green/white, blue/white. The other is a red/white. They’re both loomed with the brown 1pin connector with grey/white on the left which I think is the OBD port connector which connects from the VR6 wiring harness. If I had to wager a guess- the mk3.5 Cabrio has its hazard lights button on the center console by the AC, defrost, recirc, power top and rear window up/down buttons. The donor mk3 Jetta has the earlier mk3 style big button above the steering column. Since I can guarantee at some point this pig WILL be a hazard on the side of the road I will get hazards operational one way or the other [emoji23][emoji52]

One pin white connector. Black/white stripe. Zero idea. Can’t find an equivalent in the donor car dash wiring and the ABA engine harness doesn’t have one.

Blue female. Brown/yellow, red/blue. No idea.

I’m fairly confident this green connector goes to the last open green slot in the junction box. The only hesitation I have- it’s a black/yellow and the other three greens at junction box are black/white. Black/yellows, per the Bentley, are load reduction… so plausible that green circuit is a reduced circuit. Plus this green can’t really go anywhere else so this is process of elimination.

If anyone has any insight I would appreciate it. The odds might even be pretty good that none of these even matter, considering AC/PS/SAI/EVAP delete.

Next update will be in the next week or so after I physically drop in the engine and wire it up and do tests to see what works and what doesn’t. I will report back.


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Was your issue with the auxiliary plugs ever figured out, I’m struggling with all of them lol I bought a 95 cabrio vr swapped. I went OBD2 and now putting the harness back in is terrible

 

Don't have my Bentley on hand at the moment but I can assure you each of those connectors and wire colors is mentioned are in the wiring diagram section applicable to your specific engine. Also remember not every connector has a mating fitting or connector on the harness, VW likes to build single harnesses with all the options included even if the vehicle does not have those options. Just plugging connectors into sockets that might look like they fit into might lead to a whole world of trouble shooting later.
I would recommend to get your hands on a Bentley manual.

 

Don't have my Bentley on hand at the moment but I can assure you each of those connectors and wire colors is mentioned are in the wiring diagram section applicable to your specific engine. Also remember not every connector has a mating fitting or connector on the harness, VW likes to build single harnesses with all the options included even if the vehicle does not have those options. Just plugging connectors into sockets that might look like they fit into might lead to a whole world of trouble shooting later.
I would recommend to get your hands on a Bentley manual.

I have a Bentley, and I used it for the main fusbox connectors, I just have a lack of experience in reading the wiring diagrams, so I was kind of floating in the matching colors of wires to colors of wires, but I thought that wasn’t too smart with the lack of knowledge. Also, all the single pin connectors, do you just color coordinate those the the holders on top of the fuse box? I don’t want to assume it’s that easy lol

 

I haven’t had a chance to spend some time with my Bentley yet, but will make a point of it probably on Friday. I enjoy the wiring part I know it’s not everyone’s favorite but for my engineering mind it’s actually very calming lol. Will try to provide more info by Friday.

 

Thank you very much so if you have end up with some insight. I built the motor and did everything else necessary , but this wiring has held me up for literal months lol

 

The old school way is to buy a Bentley for the car and a Bentley for the car the engine came from. The Iterwebs is probably wrong.

The Bentley has been wrong before but it has the most accurate wiring diagrams. I have a 1988 VW but its A/C was wired according to the 1989 A/C wiring diagram.

You have to use the correct ones by year. The Interwebs just show generic wiring diagrams. Unless they are broken down by year or sometimes even by VIN, they are generic to that generation.

For instance, I bought a Genuine VW 1988 Wiring diagram book. It shows every wiring diagram for 1988. Only 1988. Not 1987, not 1989. 1988 period.

Automobiles have production changes. Usually by year but sometimes by VIN.

Often you will see a disclaimer in a sales brochure saying they reserve the right to make changes so tough shirt if you can't get one like the one in the picture. Or words to a less salty effect.

I used to work on a certain aircraft. The wiring diagrams had notes in them saying which "ship" had which modifications. You had to go by tail number to make sure you were tracing the right wire to the right place.

QA also made us carry tablets with the latest tech data. The latest tech data was downloaded to the tablets each night. We couldn't have hard copies unless they were downloaded and printed that day. This was on an aircraft that was flying before I was born.

 

This helped, YouTube search steve no harper vw ce2 aux