[Vwdiesel] gas truck to 1.9td project finally drawing to a close..

Nate Wall natewall1 at yahoo.com
Thu Mar 18 09:34:30 EST 2004

Well, the VW diesel has that little blue wire too and
its NOT the wire for the "W" (RPM terminal) on the
alternator. Its for the other little terminal, the one
next to the big lug that alternator power is tapped
from. (B+ or D+?). I think its wired to the alternater
charge warning LED in the cluster and provides the
excitation current. The "W" terminal on the diesel
alternator is hooked to the upshift control module,
dynamic oil pressure control unit (The tiny circuit
board for this sits next to the speedometer INSIDE the
instrument cluster and the one used for gas engines IS
DIFFERENT than the circuit board for diesel
applications, although they look almost identical
(Don't ask how I know this!, the cause of another
unnessary instrument cluster removal after I swapped
in a speedometer from a gas Jetta with the circuit
board attached! Close examination revealed that they
are indeed different and the warning circuit in the
diesel will not work with the boaed from a gasoline
engine) and to the tachometer on turbo diesel models.
The large red wire conects to the positive battery
terminal, I think the connection is at the starter.

--- James Hansen <jhsg at sasktel.net> wrote:
> One multiple question if you will...
> Finally getting the 1.9td into gasser truckie
> project finished and I have
> one small obstacle.
> Had the fire lit today, sounds nice with no exhaust
> system on, turbo really
> howls :-)
> I am totally without a wiring diagram for a gas
> truck.  Everything else from
> diesel truckie to Passat, but no gasser truck
> diagram... so...
> The hitch is the alternator- a motorola, which is
> now a Bosch 90amp due to
> bracketry- had to use the A2 setup. The wiring is
> different, and I've never
> done a Motorola to Bosch swap before... and I've
> never had a motorola apart
> before either to see what is what.
> The wires are two largeish red, one blue all 
> terminated at the alt plug,
> and one small red one by itself. Big red ones I
> assume are to power- is this
> via a load reduction relay, or what?  No power at
> them at present- or chase
> some popped fusible links?
>  The blue one is for I'm assuming the dynamic oil
> pressure sensor system-
> when I power it, the oil pressure buzzer goes off
> with the key on, so I
> assume it is to let the module know when the engine
> is on or off by voltage
> from the alternator.  This right?  With a bosch, is
> there a quick and dirty
> way to control the power to the dynamic module?
> relay controlled by what
> exactly...? hmm...
> small red wire is.... alt light?
> These questions and probably more...
> there's a whole mess of purple and green ones that
> used to be for the
> transmission, terminate at the trans plug. I used
> the backup light ones, but
> guesses on the function of the rest?
> Many thanks
> -James
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