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sciroccosteve · Joined: 16 Apr 2012 Posts: 215 Location: Rochester, NY

Behind my cluster pod are the circular pin connector, which appears to be intact and fine. there are also two "screws" with hex nuts.

With it hooked up like this: Coolant gauge buries hot, and fuel gauge reads whatever it wants.

NOW: There are two wires run together, within the same looming. Y/Bl, Bl.
Bl is 12v switched, and i can not get a good read on what the y/bl is.

Back to the "screws". If I run a ground wire to the bottom one, my coolant gauge reads accurate, fuel gauge doesn't read at all.

Any clue what is going on, I think it has something to do with the 2 wires that are not connected.
_________________
1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns

924RACR · Posted: Mon Jun 01, 2015 10:07 pm Post subject:

Do you mean black or blue?

Usually that abbreviation (in the wiring diagrams) means blue, but I only remember a solid black wire not solid blue?
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2595 Location: MI

This is what was behind mine, when I took it apart that brown wire wasnt to anything and never did figure out what its supposed to be for.

I do remember there being 3 I think connector lugs on the back of the gauge cluster that you would have to label because there is no indication of witch one goes on witch. In my car the connectors were already labeled by hand with a sharpie style marker..

BTW a good time saver for that job is to disconnect the speedo cable from the counting box thing in the middle of it like right in front of your brake booster, then you can pull a bunch of slack inside the car so its not nearly as tricky to reinstall.. Or where ever your speedo cable goes if you don't have that box that counts miles for the o2 sensor maintenance light..
_________________
80 Turbo - Slightly Modified

sciroccosteve · Joined: 16 Apr 2012 Posts: 215 Location: Rochester, NY

Black, sorry about that.

Yellow/Black
Black are the two wires.

My circular plug has all wires intact, and all seem to be functional

I am going to see if I cant snap a few pics of what I am talking about.
_________________
1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns

sciroccosteve · Joined: 16 Apr 2012 Posts: 215 Location: Rochester, NY

the two wires in question are hanging down.

The screw posts are in a vertical line under the circular clip.
_________________
1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns

sciroccosteve · Joined: 16 Apr 2012 Posts: 215 Location: Rochester, NY

bueller?
_________________
1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns

leadfoot · Posted: Thu Jun 04, 2015 10:48 am Post subject:

brown is ground and always will be
black is no 15, ignition circuit 12v
and yell/bk is most likely wire between low fuel warning light and sender, as it grounds part of the sender circuit it may be the reason your gauge is funky...

to access the fuel sender, pull up the carpet in the back and pop the round black cover near the filler neck on the deck... should be three connections there, run a continuity test on the wire...
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

sciroccosteve · Joined: 16 Apr 2012 Posts: 215 Location: Rochester, NY

leadfoot · Posted: Thu Jun 04, 2015 12:10 pm Post subject:

use a multimeter with continuity test to confirm... connect one side to low warning light the other side to round plug pin on the gauge
K16 should be the low fuel warning light round connector... they are numbered...
the only other empty slot should be your 15 connector...
are you missing two wires from the plug? or only one?
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

924RACR · Posted: Thu Jun 04, 2015 9:31 pm Post subject:

Those stud/nut points are for assembling the gauge, not making electrical connections. All electrical connections are through the round multipin connector.

Probably should've also asked, what year your car is...

Does sound like you might have a poor ground; that's not uncommon.

Black/yellow is the fuel sender wire for the low fuel light warning only. fuel level looks to be violet/black.

Brown is always ground, yes.

Black should be pin #11 in the connector; black/yellow should be pin #9. Black supplies power to all the instruments. (per the '81-82 diagram, but I doubt things changed across the years in this area).

The coolant temp sender is on the blue/yellow wire, #1 position.

With proper connections made, If you ground the black/yellow wire, the low fuel light should come on. If you ground the black/yellow, the fuel gauge should peg. If you ground the coolant temp wire, the temp sender should peg.

You have some wiring work to do on the fuel gauge, or possible the sender itself (very common). See the technical FAQ, but trace the wires first...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

sciroccosteve · Joined: 16 Apr 2012 Posts: 215 Location: Rochester, NY

Thanks alot guys. I'll get to it this weekend and report back
_________________
1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns