[urq] Electrical question
Tony Lum
tlum at flash.net
Fri Aug 5 19:26:34 EDT 2005
Thatcher Hubbard wrote:
> Hi all,
>
> Does anyone have any idea which pin on which connector to the back
> of the fusebox (under dash) provides the ignition-switched 12v to the
> stock ECU? I've looked at the wiring diagram in my Bentley, which
> doesn't seem to contain that information, or maybe I just don't know
> how to read it correctly?
On the old fuse box, the switched +12V, aka the "15" line enters the fusebox at
the black connector pin 2 or E2 as shown in the wiring diagram. It comes out(at
least in theory) on pin A11 to feed the F/TCU and OXS frequency valve and fuel
pump relay coil.
>
> I guess while I'm at it, does anyone have any idea how the fuel pump
> relay wires work into that?
>
The fuel pump relay coil is fed by A11 and the F/TCU grounds the other end of
the coil at pin 16. The 30 contact of the relay comes from the H connector and
the switched end (87) goes out to feed the fuel pump through a 16A fuse and a
very long wire. I wrote a long post regarding this wiring back on 9/18/2001
detailing my fixes for this underdesigned circuit.
HTH,
Tony
'83 urquattro #302
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