mark.. the T7A tound connector plug in the firewall junction box is wired as
this on my '85 Doublecab:

T7a 1  blue/black    - goes into GREEN?????
T7a 2  yellow/red   - goes into yellow/red
T7a 3   blue/green - goes into blue/green
T7a 4  brown - - - - -goes into brown
T7a 5   EMPTY
T7a 6   red/black  -  goes into red/black
T7a 7    EMPTY

Eric Dieder (sp?) said that:

T7a-1 blu/blk is the oil pressure
T7a-2 yel/red is the coolant temp
T7a-3 blk/grn is the coolant temp (+)
T7a-4 brown is the coolant temp ground
T7a-5 green is the Tachometer
T7a-6 red/blk is the starter
T7a-7 yel/red is check engine light

so apparently pin T7a 5, which is the tach pin, is empty on my doka.
what id like to know, is why T7a 1 (which apparently is the low bar oil PSI)
goes from blue/black wire into solid GREEN???

and also, why would i have the correct green tach wire in position #9 of the
14pt multiconnector inst. cluster plug in the dash, and then have it terminate
into nothingness somewhere between there and the engine compartment??  i just
find it odd that the wire was already there in the plug, but nowhere to be
found back by the engine.   so i guess i just remove the green wire from #9 and
add another green wire, or splice into the existing green wire?    id just
like to know where that wire goes.. because its obviously in the harness
somewhere..    eric had a '85 doka and so did stacy - they both said they had to add a
wire to #9 pin on the cluster plug..     i guess my doka has a "one off"
wiring harness?  strange stuff..??

chris
In a message dated 2/26/06 1:22:40 PM Eastern Standard Time,
drillock@EARTHLINK.NET writes:

> The only solid green wire inside the wiring box would be for the tach
> signal. I'd guess you are seeing the blue/green wires for the coolant
> level switch. What colors are the wires on either side of the one you
> saw as green? VW used the same basic pins and colors for all the
> Vanagons so if you have a later one to look at you can see where the
> green wire should be on the round 7 pin.
>
> Mark
>
> JordanVw@AOL.COM wrote:
>
> >hi mark...  the 2 prong plug that goes to the upper tabs on the coil only
> has
> >the one fatter green wire going to it.. the other plug has no wire (where
> the
> >smaller green tach wire would normally be)
> >in the wiring junction box on the firewall there are the 2 round 7 pin
> >connectors..  one connector plug has a small green wire going to it, but
> the joining
> >plug that plugs into it has a blue wire mating up to it on the matching pin
> >of the connecting plug....??
> >
> >so why would VW build a wiring harness with the green tach wire in position
> >#9 of the 14pt plug into the cluster, and then have the wire go nowhere?
> >where does the green wire go?  is the small green wire i see in the round
> 7pt plug
> >in the junction box that connects with the blue wire, the tach wire?
> >
> >any ideas?
> >
> >chris
> >
> >In a message dated 2/25/06 1:07:14 PM Eastern Standard Time,
> >drillock@EARTHLINK.NET writes:
> >
> >
> >
> >
> >>Look at your coil. Does it have 2 green wires to it, one larger one
> >>smaller? If not, you will need to add one. If not, how about in the
> >>wiring box, with the 2 round connectors? The tach smaller green wire
> >>from the coil goes to one of the round 7 pin connectors. Is there a
> >>green wire to one of the round connectors and if so is it connected on
> >>both sides of the connector?
> >>
> >>Mark
> >>
> >>
>