Unidentified Harness Plugs (UHP's?)

[Mikec2s]

Hello FAQers,

 

I am trying to identify a couple of plugs on my wire harness.

This harness came out of my 1976 02 which had all the smog bits and pieces. I have removed the harness while the body is being prepped and painted, and have been going through and labeling, repairing, and re-wrapping the harness. I have been able to identify almost all of the connections with the help of wiring diagrams, but can't find the 2 plugs below. The car was not running (only a block and tranny in the engine bay) when I received it and I was unable to label all connections. If anyone can tell me what the plugs are for and where they plug into, I would really appreciate it.

FYI I will be swapping in a M42, so the last question would be whether they are needed after the swap.

Thanks,

Mike

[Simeon]

I am going to guess wiper motor for the bottom one but if I wasn't guessing I would check the colour code of the wiring on the correct wiring diagram. I would also look really closely at the plugs to see if there is any DIN standard terminal numbers shown. 

[Mikec2s]

Simeon,

Thanks for the quick response. Checking closer for the DIN numbers is a great idea, and something I haven't done yet. When I was working on this last night I was pretty sure that I had identified the wiper motor plug, but definitely worth looking at again.

Additional info;

The first plug (White plastic plug) had continuity from the brown/green wire to the oil pressure switch and then to the gauge cluster plug for the oil pressure switch. It then also had continuity between the white wire in the white plastic plug, and the white wire in the second (black plug) I have pictured. The third wire (Gray/blue) on the white plastic plug I haven't found continuity for yet. Me and my voltmeter back at it again tonight!

Again thanks for the help,

Mike

[stone02]

the first plug is for the speedometer cable

revolution counter in the black box, near

the pedal box. the round plug is for the

body harness side of the wiper motor

that sends the intermittent signal to the

relay under the dash.

stone

[Mikec2s]

Awesome! Thank u so much. first plug mystery is solved. 

Second plug is still a bit of a mystery. I've got the wiper motor plug attached and still can't find where the black plug goes. What am I missing. Also, from the mystery black plug the white wire and the gray/blue wire both go to the speedobox plug, the green/white wire goes to spot6 on the gauge cluster plug, and the brown/yellow  goes to a relay socket.  I just can't figure out what plugs into the black plug. Thanks again for the help both of u. I'm close to finishing the labeling part of this project. 

 

Cheers,

mike

 

[Simeon]

http://www.2002tii.org/diagrams/bmw2002tii-usa-1974.pdf

 

Is it just '5 pole plug' number 35?

[harold]

Looks like the dash light warning display plug (US only, emissions and seatbelts).

[Mikec2s]

That would make sense, just looking at what wires are connected to it. It also makes sense why I can't find the other end of that plug. Because, it's probably hanging under the dash that is sitting in the storage unit with all the other parts. I am assuming that this would plug into the rectangular box in the middle of the dash. I will make a trip to the storage unit and see if we can put this mystery to bed.  Thank you everyone for your help. This site rocks.

 

Cheers,

Mike

[Mike Self]

23 minutes ago, harold said:

Looks like the dash light warning display plug (US only, emissions and seatbelts).

If it is, it'll have continuity to fuse 11.  That's where it draws power, and at least on the factory manual wiring diagram for 72-73 roundies, it's not on the diagram...

 

mike

[Mikec2s]

I was holding out hope for the plug 35 Simeon referenced, but need to get home to check it. The fact it may not be on the diagram helps me feel at little less crazy. I have been searching wire diagrams trying to find this thing and have found nothing except a bruised forehead from beating my head against the wall. I have new found hope all of the sudden. I can't wait to get home and grab my dirty harness and trusty voltmeter.  Thanks Guys!

[harold]

Number 96 on 1976 wiring diagram for seatbelt/emissions display.  4 wires: white, brown/yel, blue/white, Green/white.  Looks like the one.

Edited March 10, 2017 by harold
green not gray

[MildSeven]

14 hours ago, Mikec2s said:

 

That plus was a mystery for me as well... it's just hanging around loose now. I don't have that block box thing maybe PO removed it.

 

What's it's purpose? why is it counting revolutions?

 

 

[Mark92131]

18 minutes ago, MildSeven said:

What's it's purpose? why is it counting revolutions?

 

It is counting RPM's to determine service intervals and lights the EGR Service indicator on top of the dash (74-76) cars.

 

Mark92131

 

 

[Mikec2s]

I think we have solved the second plug mystery. Again, thank you everyone for your help. Props to Harold, I am pretty sure you nailed it. I grabbed the service indicator from the storage unit and it appears to fit the mystery plug. I'll test continuity tonight and verify. 

 

Cheers,

Mike