Which Colour Wires?

krzracingcouk · 25-11-15, 09:31 PM

Well I have got a little further working out what wire goes where in the engine bay. I am stuck though on some connections.

What colour wire goes on these two units and what do they do?

20vcqdriver · 25-11-15, 10:36 PM

Thats the oil pressure Transmitter/transducer for the gauge.
Which engine is it on(know its a 5 cylinder

)
Is it the GT?

Colin Aitchison · 25-11-15, 10:46 PM

On me 1987 coupe gt 2.2 KV engine there are three wires, the white wire goes on to the smaller of the two senders, the larger sender with 2 spade connectors one marked 0-5 this one goes to the oil pressure gauge the other marked 0.30 is another oil pressure switch, 0-5 connected to a blue and white wire, 0.30
connected to blue and black wire. This may help you but I think your car is older, I do have a photo, PM me with email address and I will send it to you.

krzracingcouk · 26-11-15, 08:52 AM

20vcqdriver - it is a '82 Coupe GT 5s. And yes I have the three centre gauges.

Colin - I think I have the "blue/white" and "blue/black" that reach and was wondering if they were right.

krzracingcouk · 02-12-15, 05:59 PM

Right, connected the blue/black and blue/white to the big unit and now I have the VDO pressure gauge reading but as nothing is connected to the small one so oil warning light is on on dash. Help, what colour goes on this one and where does the wire come from?

krzracingcouk · 03-02-16, 08:34 AM

I thought I would continue this thread as something new has popped up on the same lines.

I have the VDO gauge linked up so I can see the oil pressure work which I am happy with but still nothing on the small sensor for the oil warning light to out on the dash.

So why am I continuing this thread?? I had a strange one the other day - the dash light went out

and then came back on. It went out when the pressure dropped to 1.5 bar and came on when pressure was higher - yes working in reverse with out the sensor connected.

Any ideas

Colin Aitchison · 03-02-16, 08:59 AM

It may be the case that you have the wrong type of oil pressure switch, one type of switch is closed when there is no or very little oil pressure called normally closed (NC) the other is open when there is no or very little oil pressure (NO), they both look the same, you will need a tester to determine which one you have.

krzracingcouk · 03-02-16, 06:40 PM

That is the thing, the pressure switch for the dash warning light is not connected, only the wiring for the VDO gauge.

25-11-15, 10:36 PM	#2
20vcqdriver 4 ring whore! Classic Audi Club Member Join Date: Dec 2007 Location: Wirral Posts: 3,910	Thats the oil pressure Transmitter/transducer for the gauge. Which engine is it on(know its a 5 cylinder) Is it the GT? __________________ Coupe quattro 1986:-~450bhp + loooong list of mods! Audi A7 Bi-TDI SLine Black edition 2015 mapped to produce 600lb/ft torque! Audi S4 4.2 V8 cabriolet 2004:-

26-11-15, 08:52 AM	#4
krzracingcouk Grown up member Classic Audi Club Member Join Date: Aug 2007 Location: Plympton, Plymouth Posts: 471	20vcqdriver - it is a '82 Coupe GT 5s. And yes I have the three centre gauges. Colin - I think I have the "blue/white" and "blue/black" that reach and was wondering if they were right. __________________ Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM

02-12-15, 05:59 PM	#5
krzracingcouk Grown up member Classic Audi Club Member Join Date: Aug 2007 Location: Plympton, Plymouth Posts: 471	Right, connected the blue/black and blue/white to the big unit and now I have the VDO pressure gauge reading but as nothing is connected to the small one so oil warning light is on on dash. Help, what colour goes on this one and where does the wire come from? __________________ Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM

03-02-16, 08:34 AM	#6
krzracingcouk Grown up member Classic Audi Club Member Join Date: Aug 2007 Location: Plympton, Plymouth Posts: 471	I thought I would continue this thread as something new has popped up on the same lines. I have the VDO gauge linked up so I can see the oil pressure work which I am happy with but still nothing on the small sensor for the oil warning light to out on the dash. So why am I continuing this thread?? I had a strange one the other day - the dash light went out and then came back on. It went out when the pressure dropped to 1.5 bar and came on when pressure was higher - yes working in reverse with out the sensor connected. Any ideas __________________ Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM

03-02-16, 06:40 PM	#8
krzracingcouk Grown up member Classic Audi Club Member Join Date: Aug 2007 Location: Plympton, Plymouth Posts: 471	That is the thing, the pressure switch for the dash warning light is not connected, only the wiring for the VDO gauge. __________________ Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM

25-11-15, 10:46 PM	#3
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,327	On me 1987 coupe gt 2.2 KV engine there are three wires, the white wire goes on to the smaller of the two senders, the larger sender with 2 spade connectors one marked 0-5 this one goes to the oil pressure gauge the other marked 0.30 is another oil pressure switch, 0-5 connected to a blue and white wire, 0.30 connected to blue and black wire. This may help you but I think your car is older, I do have a photo, PM me with email address and I will send it to you.

03-02-16, 08:59 AM	#7
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,327	It may be the case that you have the wrong type of oil pressure switch, one type of switch is closed when there is no or very little oil pressure called normally closed (NC) the other is open when there is no or very little oil pressure (NO), they both look the same, you will need a tester to determine which one you have.