RobbieStrosek

So aint that the blue wire going from 14pin to the central warning box pin 12- of black plug ?

that one gives 12volts on engine running, or do i have the wrong wire in mind ?

Thnx Carl and Flyvmo

FLYVMO

Prior to '84 I think it was the engine pulse that turned off the warning lights. Believe it is terminal 50? (can't recall for sure, but I'm sure Alan or Stan would know) Don't have the wiring diagrams handy at the moment. But if you haven't replaced the ignition switch, I highly recommend doing so. It can cause all kinds of weird behavior. On 2 of my 3 928's it has failed, so it is a common failure point with age.

Cheers!
Carl

RobbieStrosek

Cheers thnx FLYVMO, i took the ignitionswitch apart 5 times already. Messured it while turning, all seems to be working okay.

Also the Blue wire cominf from the 61 terminal (alternator) gives me 12 Volts on running engine.

Im losfer words, dunno what to do. Already bought a different working Central warning box and i ordered a new ignitionswitch... maybe one day ...

FLYVMO

While you are" in there" and cleaning, you might want to check your connector at the jumpstart post in the engine compartment. Make sure the wires are not cracked or chafed and that you don't have any corrosion on the pins. As many previously have stated, replacing the ignition switch cleared the same errors you were seeing, so I hope you will report back with some good news when you have replaced it.

Cheers!
Carl

RobbieStrosek

Yes mate already did that , took it apart to, cleaned it . Mesured the wires against ground, al seems fine. Only hope now is the new ignitionswitch...

Thnx

RobbieStrosek

Update:
Got the new ignition switch, but no difference. All the lights keep on shining...looks like a xmas tree.

Well maybe ill just leave the black connector out of the central warning system box...

If anyone has any other ideas, please let me know...

thnx y'all

RobbieStrosek

Can anyone tell me with what diagram for wiring i should look at my 9184 EURO car ?

i use a diagram for a 1985 now, together with the one for the 1984 that kinda sucks , that 1984 diagram is so not handy..

i have this odd thing with my 928, when i start all the lights in the dash stay on, but when i turn the key back so that the engine stops, and then quickly turn it in start position again the lights go out, and i can test my central warning system by pulling the handbrake etc etc, it all works.

i did the pin14 cleaning, i did the new ignition switch, i cleaned the ground points, i cleaned the relay and fuse box and i bought e new central warning module...

its prolly something very stupid and small but i wonder what it could be, also de ABS light don't work. The former owner did a small bridge behind the dash to make it work...dunno if thats a thing but i want to take it obe step at the time...


cheers and i hope someone can figure this one out...

R.Pires

Hi,

That's strange indeed....
Just another idea: remove the instrument cluster to clean everything and check the plugs behind it, there are 2 large plugs wit a lot of wires each, maybe, just maybe, if the PO messed with the cluster, he connected these plugs the wrong way, the left on the right and vice versa!
I really don't know if that's even possible, to be honest, but it's just an idea.
Here you have a link to a step by step cluster removal, exactly for an 84.

http://dwaynesgarage.norcal928.org/P...Repair%20I.htm

Hope this helps!
Regards and good luck

Alan

Starter activation I believe.

Alan

RobbieStrosek

Hi R.Pires, i considered that possibilty to, but its connected the right way. ive cleaned all the connectors and the dash aswell. mesured them as ther where connected to.

Hi Alan,
what you mean exactly? you mean the starter activation as the solinoid or the starter engine itself ?

Mrmerlin

I did a search and found this thread has lots more detail.
I hope you can figure things out.


https://rennlist.com/forums/928-foru...entral+warning

RobbieStrosek

Yeah i read that post to, seems he had a alternator thingy...
Maybe something else to consider is that this car hasn't been driven for like 3 years..before i took it home.
It has a new Battery, and the voltage is a good 13,8V with engine running..

Its gonna be a hassle to figure out what's wrong, maybe its a relay that needs to kick in after starting, or a relay that needs to release after starting..

Is it so that the lights go out after the engine is starting up ? I mean when i take out the fuelpump fuse, would the lights go out on a good car ?

RobbieStrosek

Update rexpontius just found out that my 84 needs to be looked at with the 83 wiring diagrams...

Also i seem to be missing the number 14 wire on the black connector that fits the central warning unit.

Now this number 14 wire comes from the 50 (starter +12volts), when i connect it the lights go out, so its out of the test sequence.

But however, when i turn the lights (key) of and want to try it again right away, this wil not work anymore, i have to wait for like 10 minutes . So after 10min. i start, i put pin14 of the black connector to the 50 and the lights go out again....

how funny is that ?

rexpontius

Problem has been solved! Well more or less :-)

The missing wire on the black connector (pin no. 14, not to be mistaken with the 14-pin connector) gets the unit out of light test mode when applying a 12v+ Pulse.

After the pulse it needs to be connected to ground, otherwise it will take approx 10 mins to be able to get the unit out of light-test-mode again.

Problem is solved by installing a relay that is normally connected to ground and send a 12v+ pulse when the starter is engaged.

So it now works as it should, but it is still a mystery why the wire was missing in the first place...

Cheers

RobbieStrosek

Yeah great, altho its not original i think But it gets the job done....

Now for the ABS part, those wires are placed in the Yellow connecter. But ABS dash light is not working. Not even on innitial startup....

So ABS test lights aint comming on , unless i put back the bridge wire on the back of the dash.
But i don't think thats a good thing to solve like that..

Can someone tell me on what pin numbers they have there ABS wires in the Yellow connector ?