E to I wiring

[dougie30]

ohh ok i understand, so if i cant find an 87 harness, is there a wright up on how i should mod the later harness? or is every thing i have to do to mod it, in your first post?

[dnick]

does anyone know what pin/wire to splice the c104 tach wire into? 84 to 89

[jlevie]

The tach signal is the blue/black wire from pin 6 of the DME connector. The econometer is a white wire from pin 32 and the START input is the green wire to pin 27.

[dnick]

thanks a lot !!!

[dougie30]

could someone find a write up on how to modify the harness? iv searched and have not found any thing. just a few people asking for certain wires here and there

Please help!

[Supratreo]

:ohi, sorry to bring this back from so long ago but I'm a little confused and needed some help.
I'm doing a complete I conversion on an 87 E. Basically converting the car to a 325i, right now I'm not sure but I believe I have a 90 harness so it sounds like it won't be PnP. Is pin 20 the only thing I need to worry about? A lot of people are saying the harness needs to be modified which sounds like there's a lot more to it but just modifying one pin is easy enough. Is it that simple or are there some pretty extensive modifications that need to be made that im missing?
Thank you

[varg]

Found this here: http://www.r3vlimited.com/board/showthread.php?t=192882
1990+ 325i
1. Charge - Bu - ?
2. oil level - gn/yl, bu/bk - signal
3. .
4. coolant temp - br/vi - signal
5. oil pres - br/gn, bk/br - signal
6. oxy heat - gn/wt, gn/yl - +12v
7. ignition coil - gn - +12v
8. fuel rate (econo)- wt/bk, yl/wt - signal
9. tach signal - bk - signal
10. oil level - bu, vi/gn - signal
11. inspection reset - wt/gn, wt/bu - signal
12. check engine - gy, br/bk - signal
13. fuel relay - gn/vi, vi/red - +12v
14. speed - bk/wt, bu/yl - signal (from instruments to ECU from cluster C2 Pin 10 bu/yl)
15. unloader - bk/gn - signal
16. srs - wt/bkv -not used
17. ABS Communication - bk/yl - signal (325ix only)
18. starter - bk/yl - +12v
19. .
20. ABS power - rd/yl - +12v

And this:

1987 325i
1. Charge - Bu - ?
2. oil level - bu/wt, bu/yl - signal
3. .
4. coolant temp - br/wt, br/vi - signal
5. oil pres - br/gn, bk/br - signal
6. oxy heat - gn/wt, gn/yl - +12v
7. ignition coil - gn - +12v
8. .
9. .
10. oil level - bu/yl, vi/gn - signal
11. inspection reset - wt/bu - signal
12. check engine - br, br/bk - signal
13. fuel relay - gn/vi - +12v
14. speed - bk/wt, bu/yl - signal (from instruments to ECU from cluster C2 Pin 10 bu/yl)
15. .
16. srs - wt/bkv -not used
17. .
18. starter - bk/yl - +12v
19. .
20. .

I did not see the '87 325e listed so I looked at the ETM and verified these:
1987 325e C101
1. Alternator excitation, bu
2. Static oil level, bu/yl
3.
4. Coolant temp gauge, br/vi
5. Oil pressure light, bk/br
6. O2 sensor heat, ECU power, gn/yl
7. Ignition coil power, gn
8.
9.
10. Dynamic oil level, vi/gn
11. Inspection light reset, wt/bu
12.
13. Fuel pump relay, gn/vi
14.
15.
16.
17.
18. Start, bk/yl
19.
20.

Safe to say the '87 e and i C101 pinouts are the same imo. Also have a look here: http://www.r3vlimited.com/board/showthread.php?t=100939

[TobyB]

pin 20 of C101 on the body side of early cars is grounded and as I recall there isn't a wire to 20 on the harness side. But on later cars that pin has some other function and isn't grounded.

Yes, as above, on late cars, pin 20 is +12 at 20+ amps for abs or airbag.
Even though the body side doesn't say it, 20 is usually grounded with
small diameter wire.
When you turn things on, the small body wire starts smoking.

ALL YOU HAVE TO DO IS CLIP PIN 20. It is absurdly easy.

Then the car will start and run.

You'll have to move 2 other wires to get tach and something else, but that's not
too hard.

This isn't rocket surgery.

t

[Supratreo]

thank you guys very much for clearing that up.
i thought it would be that easy.
as far as the inside goes, isnt there 3 wires you need to splice? tach, CEL and i believe the eco. gauge.