Engine loom plug pins?

[Andy325i]

Does anyone have a list of which pins are for what as regards to the plug where the engine loom plugs into the car loom (mounted on the bulkhead)

Kind regards

Andy

[Brianmoooore]

Here goes - all worked out the hard way when doing M50 conversion.
1/ blue, ignition light
2/green/yellow, oil level
3/ NC
4/ brown/purple, water temp
5/ brown/green, oil pressure
6/ green/white, ignition power from fuse 9 for lambda sensor
7/ Green, ignition 12V+
8/ white/black, fuel rate to A11, instrument cluster
9/ black, engine speed to A7, cluster
10/ blue, oil level
11/ white/green, service light reset
12/ grey, engine ECU check light
13/ green/purple, fuel pump
14/ black/white, speed signal to cluster
15/ black/green, small term on starter solenoid, (unloader relays)
16/white/black
17/ NC
18/ black/yellow, starter
19/ NC
20/ red/yellow, 12V+ from main relay to ABS

This lot are for the engine loom of a 89 325. Pins 16 and 12 were NC on the body loom.

[Andy325i]

cheers mate! you are a star! I am going to be starting my M52 conversion in the next couple of weeks

[Karan]

Ian has loadsa wiring diagrams..... give him a pm if u need help.... hes always more than willing to help out those in neeed of powaaaaaaaaaaaar

[Brianmoooore]

I've got the corresponding pins in the M50 (same as M52?) loom as well, if you want them sometime.

[Andy325i]

Brian, you must be a mind reader! I was thinking exactly that whilst working very hard, ok so I was actually just stood there thinking about the enginge change, but anyway lol!

That info would be much appricated.

How are you getting on with yours btw?

what exhaust and brake Master cylinder setup are you running mate?

Kind Regards

Andy

[Brianmoooore]

M50TU engine plug connections (93 525i)
Right hand column is equivalent E30 pin.
1/ blue/white, oil level 2/ green/yellow
2/ blue/yellow, oil level 10/ blue
3/ red/white, to ABS 20/ red/yellow
4/ black/blue, aircon
5/ black/grey, aircon
6/ purple/grey, aircon
7/ black/purple, drive away signal for OBC
8/ grey, engine ECU check light 12/ grey
9/ NC
10/ NC
11/ brown/yellow, water temp
12/ brown/purple, water temp (use E30 sensor) 4/ brown/purple
13/ green/purple, fuel pump 13/ green/purple
14/ black/white, speed to cluster 14/ black/white
15/ black/green, unloader relays 15/ black/green
16/ white/yellow, Rx data
17/ white/purple, Tx data
18/ black/yellow, starter 18/ black/yellow
19/ white/green, service reset 11/ white/green
20/ black, engine speed to cluster 9/ black
21/ green, ignition 7/ green
22/ green/white, (not sure from my notes if I connected this one or not!23/ brown/grey, oil pressure 5/ brown/green
24/ white/ black, fuel rate 8/ white/black
25/ blue, ignition light 1/ blue

Hope all that is of some use - it took me a few happy hours to work out originally, but I got it all right the first time, except for transposing the two oil level wires.

My conversion is finished now, having finally found and fitted an air filter and suitable diff. The car has only done about 100 miles so far, being a bit lacking in the MOT and tax departments.
Have just done a few things for MOT, and am now attending to some surface rust on the paintwork.
Depending on how much spare time I can find, I intend to have the car on the road legally at the beginning of May or June.
Eventually, I will be removing the whole set up from this somewhat scruffy shell, and transferring everything, along with a LPG set up, into a very tidy silver touring that I have.

Exhaust system is manifolds from an E36, with the rear one shortened by about six inches, into downpipes cobbled together from E30 and E36 downpipes, joining to standard E30 325 system just in front of the gearbox exhaust bracket.
Brake master/servo is standard E30, moved as far as possible towards the side of the car, using a modified pullrod across the car from an E34.

[Andy325i]

Brake master/servo is standard E30, moved as far as possible towards the side of the car, using a modified pullrod across the car from an E34.

How did you move it mate? did you redrill the bulkhead?

[Brianmoooore]

Yea, made up a strengening plate for each side of the bulkhead, elongated the big hole and drilled holes to suit, and made an extension piece for the brace to the tunnel.
Moved 25mm in total.
You don't see this method in the various instructions you find on the web for M50 conversions, because it can't be done on LHD cars.
Did something similar with the steering bulkhead bearing as well to clear the exhaust.

[Andy325i]

Did something similar with the steering bulkhead bearing as well to clear the exhaust.

How do you mean mate? I am thinking of doing the E36 rack conversion while its out on the floor.

did you use the 525i engine loom?

Where did you mount your ECU?


Kind regards

Andy

[Brianmoooore]

Moved the bulkhead steering bearing 30mm outwards. Had to rearrange the clutch pedal bearing a bit and bend the pedal.
Tried an E36 rack but couldn't get it to fit because of the angle of the pinion shaft.
Used the 525i loom. Had an E36 loom to try as well, but I reckon the 525 is the best bet. The wiring box hangs nicely from a cuuple of studs fitted to the heater access panel.
I fitted the ECU in the same place as the standard E30, with the three main relays under the steering column as well, but to do this I had to extend the ECU part of the loom by 13". This was quite a bit of work, and if I was doing it again, I would make up some kind of waterproof box and fit the ECU and the relays on the front battery tray, after evicting the battery to the back of the car.