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Re: Engine bay wiring dilema
Posted: 13 Apr 2025, 20:16
by Smiffo
Robsey wrote: ↑13 Apr 2025, 20:13
Yellow / Red is definitely the coolant temperature gauge wire
Blue/Green is fluid level switch to the shortage indicator module [42] or [43] in the fuse box.
The coolant led should flash for a few seconds when the ignition is turned on.
Plain yellow is the 0.9bar oil pressure switch for dynamic oil pressure circuit
Blue/black is the 0.3 bar oil pressure switch for the dash led.
Oh darn. You’re right. brain fart moment.
Why would it cause dash to flash and needle not move when connected to something though, Robsey?
Unless it is the few seconds of self check ofc.
Re: Engine bay wiring dilema
Posted: 13 Apr 2025, 20:23
by Robsey
As you say - coolant led should flash for a few seconds as part of a self test.
Any longer than 6 seconds (I think), then the coolant level is too low, regardless of indicated temperature.
To bypass the level switch, short the blue/green to earth.
As for the original query about the oil pressure led flashing.
This is why I queried the wiring order within the cluster.
But my head cannot see why the led would flash, unless it was a loose or intermittent connection.
Then it would flicker, not flash.
Re: Engine bay wiring dilema
Posted: 13 Apr 2025, 20:30
by Smiffo
Robsey wrote: ↑13 Apr 2025, 20:23
As you say - coolant led should flash for a few seconds as part of a self test.
Any longer than 6 seconds (I think), then the coolant level is too low, regardless of indicated temperature.
To bypass the level switch, short the blue/green to earth.
As for the original query about the oil pressure led flashing.
This is why I queried the wiring order within the cluster.
But my head cannot see why the led would flash, unless it was a loose or intermittent connection.
Then it would flicker, not flash.
I think I’m going to sit this one out for a bit. I must be reading it wrong or I’m tired lol.
I was reading it as flashing when yellow/red connected to something, but no needle movement.
Yes, 6 seconds self test is spot on memory. I was going through all of mine last week.
Re: Engine bay wiring dilema
Posted: 13 Apr 2025, 20:46
by Robsey
No worries my friend,
All these different colour-schemes, model-year changes, and differences between country specifications can confuse the best of them.
I have been tripped up a fair few times, especially with the use of two switches for the later oil pressure system and the separate switch and sensor circuits for the cooling system.
Re: Engine bay wiring dilema
Posted: 17 Apr 2025, 14:51
by Dueller
Cheers everyone, this is the last hurdle for me
Drove the van today, went very well but odd having no dash lights
Will go again in a bit and try your suggestions re earthing them out
Got a dongle and App so reading the engine on that ok but not the same as having dash lights
Always thought my dash had been changed for a lower spec model so questionable as to what works, I know the fuel gauge has worked in the past so probably needs a visit to the petrol station
Re: Engine bay wiring dilema
Posted: 17 Apr 2025, 17:49
by Robsey
The dash illumination is the grey/blue wire, which is the output from the lighting rheostat.
Later dash =
Should be pin 1 on the 14 pin dash connector.
The ground is the same brown wire used for the whole dash on pin 3.
On early dash =
Should be pin 3 on the 14 pin dash connector.
The ground is two brown wires used for the dash on pins 2 and 5.
Re: Engine bay wiring dilema
Posted: 18 Apr 2025, 16:17
by Dueller
Seems my dash pod is a problem, loads of messing about and now fuel gauge works and temp flashes and goes off
Battery and oil still the same
Thinking I will rewire those 2 directly
Any other ideas anyone??
Thanks again
Re: Engine bay wiring dilema
Posted: 18 Apr 2025, 16:17
by Dueller
Robsey wrote: ↑17 Apr 2025, 17:49
The dash illumination is the grey/blue wire, which is the output from the lighting rheostat.
Later dash =
Should be pin 1 on the 14 pin dash connector.
The ground is the same brown wire used for the whole dash on pin 3.
On early dash =
Should be pin 3 on the 14 pin dash connector.
The ground is two brown wires used for the dash on pins 2 and 5.
Sorry meant battery and oil warning lights
Re: Engine bay wiring dilema
Posted: 18 Apr 2025, 20:02
by Dueller
...and after I put it all back together nothing works again
Have started looking for a replacement clock set
Still thinking of rebuilding mine with more mechanical stuff to it
Re: Engine bay wiring dilema
Posted: 19 Apr 2025, 07:19
by Aidan
I have a good condition basic petrol flexi board here, ie no clock or rev counter, later type for bod circuit, and I have bod circuits, but no decent binnacles or speedos
Re: Engine bay wiring dilema
Posted: 20 Apr 2025, 08:05
by Dueller
Thanks Aidan but I've realised I need a new binnacle as the slot where the plug goes on has been snapped off
Thinking one of these
Re: Engine bay wiring dilema
Posted: 20 Apr 2025, 09:12
by Robsey
Re: Engine bay wiring dilema
Posted: 20 Apr 2025, 09:49
by Aidan
I also have a foil complete with working clock that has the tab intact, but track 1, dashlights, is foobarred at the 14 pin connection but working around that should be pretty easy
Re: Engine bay wiring dilema
Posted: 20 Apr 2025, 20:28
by Dueller
Thinking I'll move away from the vw design at the moment Aidan, will look into the alternatives
Thanks bud
Re: Engine bay wiring dilema
Posted: 20 Apr 2025, 21:10
by Dueller
Any contact details for AngeloEVS at all bud??
Can't find him on FB
