Wiring help again

aearch

Well-Known Member
Site Donor $
Messages
4,122
Reaction score
592
Location
pleasant hill , ca
Is there some reason i would read to ground on the green wire at fuse #8?
it goes the the 74cs front window relays.
i can check the wires, but i thought i might ask for some help here, before i take it all apart again.
to the left it goes to the reverse switch and up to the no longer needed auto chokes.
to the right it goes to the 74 push button breakers, then on to the window switches.
it only reads to ground when the relay is inserted, and they are new.
GREEN.jpg
 
Make sure the installation pattern of the relay matches the socket in the car. I know some of the sockets in my car will accept a newer relay, but will not function properly because the standard pattern of the newer relay does not match the installation pattern BMW used in our cars. You should be able to compare the pattern on the bottom of the relay to your wiring diagram.
 
right thanks
i figured it out power is to 86 then thru the relay to 85 at ground
the power is always to the relay and active.
when the ignition is on the relay is on for the windows and the headlights which is what the lines go to.
now i just have to figure out why
NOTHING WORKS.
i have grounded the eta and oem harness and have power to the fuses. but no lights no fans, no windows
nothing. the wiper motor works.
so i have my work cut out for tomorrow.
ill get out all three ohm meters and go nuts
i sure the wiring though
 
Last edited:
If you have no lights, no fans and no windows, check your load shedding relay. The purpose of this thing is to disengage certain circuits when the starter is engaged. Once the car is running this is supposed to enable these circuits to work. I believe the circuits you describe are all subject to the load shedding relay.

Also, as to relays, generally terminals 85 and 86 are control terminals. Thus, if terminal 85 is grounded in your circuit I would think terminal 86 would go to the window switch. Before power gets to the window switch, however, the ignition switch needs to be engaged, the fuse needs to be intact, and the load shedding relay needs to be working properly. So, you should not have power on all the time at terminal 86.

There may be power that is always active to terminal 30 (with the window motor itself connected to terminal 87), although even with a relay in the circuit I would think this power would be fused. This power would only be directed to the window when the switch is depressed (and the ignition key is turned to either positions II or III, the fuse is intact and the load shedding relay is working) and the relay is properly functioning. But if you are reading a multimeter, this power will be there and available to run the windows when the switch is depressed.

Again, back to my first post, are you getting the terminal designation off the relay or from the wiring diagram? If you have a relay that is not appropriate for the wiring socket you might be looking at terminal 30. Compare the terminal designations on your relay to the socket designations on the wiring diagram.
 
W1.jpg
fantastic, thank you for the excellent description.
it think i dont have the relay at the brake booster there.
the wire on the right that is hidden is blk /wht,
so would logically go to a relay, right?
 
I'm not sure. The connector you are looking at may be connector number 29 in the wiring diagram because connector 29 has a green white wire coming from fuse 8 and a green wire coming from fuse 8. Can you post a picture of the portion of the wiring diagram to the left of the portion you have posted. If we can see where those wires go we can tell if they are the associated with your window problem.
 
The triple terminal with green/white is automatic choke. I can't find the 2 black/white and black/red on the left and I've been looking. Do I have the colors correct?
 
I just pulled my wiring diagram and I don't have a connector like the connector with the 2 black/white and the single black/red wire. I'm not sure this is a relay connector, they typically have four wires (or is there a wire behind the three we can see?).

Alan -- sometimes you can find these things by looking for the particular combination of wires on the diagram. Using the numbering system, identify each connector by number. Then go through them on the diagram one by one looking at the colors of the wiring until you find a combination of wires that matches that thing.
 
great thanks to you all.
Rright the three is indeed the auto chokes.
The other is a two black/wht on one side and blk/violet opp.,
so after studying the diagram for a long time i know that blk/violet only goes to wiper motor
and blk white are mostly lighting
so maybe i can track them that way.
but the black /wht is common to the choke also , so that must be the power to those
so the two must be power.
 
coil.jpg
im curious,
why there is a wire from the starter to the coil
its not there in my eta harness
and can't see it in the oem
i called the person that did the meld
but im sure you wizards out there can help sooner.
 
Last edited:
That wire provides a full 12v to the coil when cranking, when in the run position the coil gets ballast voltage (less).
 
Back
Top