Wiring link confirmation needed urgently

[peanut]

Hi all hope someone can help as I now stuck.

I need someone to verify where 2x wires lead to from the underside of the fuse relay box on my 1989 S2

The wires tails that have been left have been cut very short and I have been unable to verify the connection they should make from the wiring schematics I have.


On the E connector block plugged into the underside of the Central Electric (Fuse Relay ) block there are 2x small identical black/yellow wires approx 1.0mm
I need to know if these two wires should be joined together as a LINK as I suspect they do ....or should feed into one of the many wiring looms that connect to the underside of the fuse relay box.

it should be possible to see the wires coming out of the E connector block with a torch looking up from the passenger footwell. Perhaps someone may have a spare fuse relay box and loom off the car or accessible ?

 

[peanut]

the E connector block

 

[Indi9xx]

In the wiring block you have 4 rows of 5 pins, the pins are numbered 1 to 5 and the rows are numbered 1 to 4.. Which row number and pin number are the two ends of the wire connected into?

With this I can tell you if they should be linked.

However, black with a green stripe and black with a white stripe are usually for indicators in european wiring colour code standards.

 

[peanut]

Thank you for responding Jon

Apologies I have just noticed that both wires are Black/ Yellow ! not Black /Green which was a typo
For some reason the image of the E block connector did not upload ?
i'll include it again hopefully.

The two wires I am unable to locate are both 1.0mm Black /green wires
one on Row 3 Pin 2
second on Row 4 Pin 4
Row 3 Pin 2 on the connector connects to terminal 86 of the DME relay on the fuse relay board, so that particular green/yellow wire should originate ultimately at the Ignition switch and be switched live to energise the coil on relay 1 . I could just connect a bypass but I'd like to be sure I don't leave a bare switch live somewhere in the loom.

I have the full Electrical wirig Supplement 23 but I am still unable to trace where these two wires originate from .

 

[peanut]

I am becoming increasingly convinced that the two Black Yellow tails are in fact normally linked together.
I have studied several fuse relay boxes and wiring looms for sale on the net and several images would suggest a link.
What I need is someone that has a wiring loom or relay/fuse box who could take a look for me .[&o]

 

[peanut]

linked ?

 

[Indi9xx]

Have checked, it is a link wire and so they should be connected, it is used as a port for an immobiliser to break the circuit for the DME relay.

 

[peanut]

ORIGINAL: Indi9xx

Have checked, it is a link wire and so they should be connected, it is used as a port for an immobiliser to break the circuit for the DME relay.

thank you Jon for checking that for me its much appreciated
I have literally just this minute got off the phone with Porschapart who checked their spare loom for me and also verified its a link.

Having it as a break point for terminal 86 on the first DME relay makes perfect sense now . Switch live from the ignition switch is fed into the fuse relay board then back out on the black/yellow wire and straight back in to terminal 86 to energise the coil of the first DME relay. Once I find the route of the switch live feed in the relay fuse board I'll post the whole schematic for the E & M terminals which connect to the DME relay

I can now go put my car back together ! many thanks

 

[tref]

I'll be interested to see that. With an intermittent starting problem that I haven't been able to ever track down (every time I think I have cured it, it will catch me out again!) I dared not lift the fusebox unless I was safely at a location where the car could be fixed. Sooner or later I am going to have to go in there, but at the moment, if it isn't broken (too badly) I'm not going to fix it!

 

[Indi9xx]

Nine out of ten recovery trucks from the RAC or AA which are bringing a 944 to our workshops following a car failing to start or cutting out is down to an unknown aftermarket alarm system finally failing and coming back to life and ruining the show.

I am often amazed to remove anything from one to five alarm systems from a 944 where the customer only expected there to be one and often the installation of these alarm systems has been a complete hash and even if someone was given a VSIB or Thatchum certificate by an installer, because they have not been installed to standards and insurance company would never have paid out if they had the chance to inspect the car following an acident or theft.

 

[tref]

Without doing the "You've got an elephant? Well I've got a box to put it in..." thing... Claire's Cab had six breaks in the big red and something wire from the ignition switch to the fusebox. I replaced the loom.

I do find it a very satisfying job though, when you just turn the key and it starts, as Porsche intended, without the prior immobiliser faffing about...

I still have two more to do. One day, when it's quiet...

 

[peanut]

ORIGINAL: tref

Without doing the "You've got an elephant? Well I've got a box to put it in..." thing... Claire's Cab had six breaks in the big red and something wire from the ignition switch to the fusebox. I replaced the loom.

I do find it a very satisfying job though, when you just turn the key and it starts, as Porsche intended, without the prior immobiliser faffing about...

I still have two more to do. One day, when it's quiet...

yeah its very satisfying to be rid of it . Its like ivy no matter how much you pull out theres still more left . I now have a boot full of wire .
I reckon that there is more wiring removed than is left in the car![]
Today I had to remove the dash fascia and both door cards and replace them all.

I'm turning the key tomorrow Tref so keep everything crossed .

 

[peanut]

ORIGINAL: Indi9xx

Nine out of ten recovery trucks from the RAC or AA which are bringing a 944 to our workshops following a car failing to start or cutting out is down to an unknown aftermarket alarm system finally failing and coming back to life and ruining the show.

I am often amazed to remove anything from one to five alarm systems from a 944 where the customer only expected there to be one and often the installation of these alarm systems has been a complete hash and even if someone was given a VSIB or Thatchum certificate by an installer, because they have not been installed to standards and insurance company would never have paid out if they had the chance to inspect the car following an acident or theft.

I guess 25+ years ago just about anybody could set themselves up as a Auto technician / auto security installer operating from their garden shed.
Some of the wiring in mine is bordering on criminally negligent. I wouldn't want to be in a car when a 4.0mm cable suddenly shorted out . Had it happen once and the cab fills with acrid choking smoke within seconds and the wiring quickly catches fire under the dash

 

[peanut]

ORIGINAL: tref

I'll be interested to see that. With an intermittent starting problem that I haven't been able to ever track down (every time I think I have cured it, it will catch me out again!) I dared not lift the fusebox unless I was safely at a location where the car could be fixed. Sooner or later I am going to have to go in there, but at the moment, if it isn't broken (too badly) I'm not going to fix it!

I was a bit hesitant at first but with the battery disconnected and removing tie wraps as you go its fairly easy to lift the fuse relay box out at least 6" or so to turn it on its side and get to the connectors and loom.

I suspect a lot of intermittent problems are due to poor earthing around the fuse relay board and dodgy soldered connections wrapped in electrical tape .
If you fancy having a go at removing the alarm sometime then take a trip up here and we'll do it together

 

[Indi9xx]

I have a 944 Turbo in the workshop at the moment which had been suffering intermittant alarn and radio issues for some time over a couple of years until it eventually completely stopped starting while in my care recently.

It seemed to have these intermittant problems whenever the customer got the car back from us, which really confused us as it never played up when with us.. Then on this last visit it had a large sub woofer in the passenger footwell.

When it stopped running for us we removed the sub woofer to investigate the alarm/immobiliser, which was a reasonably recent Sigma and what we found when looking up under the glovebox horrorfied us! A mass of crimps, chocolate blocks (the lego style screw terminal blocks) and scotch blocks (the blue splice connectors), bare wires taped up with insulation tape.

It seems the Sigma, Parrot hands free and decent head unit had all been wired in with these components which should only be used as a "get you home measure", not for any kind of proper install.. and all of this was installed in the last 3 years.

But what had happened is every time the car was brought to us the owner had removed the sub, as soon as he got it home he would install it again, this wash pushing on the glove box and centre console, making and breaking contacts in these dodgy connectors and shorting out other wires... Every time he would bring it back to us, the sub was removed and the problems would either go away or be intermittant again... Having a clearly grumpy and failed alarm was what allowed us to get authorisation to dig deeper and find this mess.

By all accounts this mess was all made by a professional installer who gave a VSIB/Thatchum certificate for the install, even though none of it was anywhere near up to those standards.. or even up to what a DIY enthusiast would have done with any common sense.

Final outcome was the sigma was permanently damaged as well as the KLR and DME due to short circuits.

Wiring repaired... properly with everything removed, returned to standard with proper heat shrunk solder joints, and then the accessories properly wired into the right kinds of supplies in the right ways and a loaned pair of ECU's now has the car running again.

If anyone has a DME and KLR going spare, the customer is a member here and is trying to find a pair in working condition for a reasonable price and does not have an endless pile of cash to spend.

But you are right.. This car alone is a good example of how there are some people out there messing around with auto electrics who should not be, and I too would use the phrase "criminally negligent" to describe this particular cars alarm and radio install.. But it by no means is an iscolated case!

 

[peanut]

ORIGINAL: Indi9xx

But you are right.. This car alone is a good example of how there are some people out there messing around with auto electrics who should not be, and I too would use the phrase "criminally negligent" to describe this particular cars alarm and radio install.. But it by no means is an iscolated case!

what a nightmare situation !

The problem with this sort of scenario is that a marque enthusiast garage owner like yourself would want to have a happy and satisfied customer and intermittent problems like this that don't get resolved quickly are so frustrating !. Eventually you must end up doing work for nothing because you feel that as the expert you should be able to diagnose the source of the problem and you're naturally are sympathetic to the car owners predicament. Impossible !
Hope he saw the funny side

The cheapest spares I know of at the moment are believe it or not Douglas Valley ! via Steve Strange on ebay.
He is currently selling alternators and starter motors at under £30 each posted 24 hour free ! He replaced a faulty starter I bought ,free within 24 hours ... you can't ask more than that .