Turning key to ign. on energizes the 15 circuit. Turning the key to
crank engine energizes the 50 and IIRC, part of the 15 circuit at same
time.

Check the diagram and follow 50 wire(s) from the starter switch. One
should go to ECU. (ECU 1 ?)  Maybe fault lies there?

Neil.

On 11/6/14, Dan Barrett <dbx@pobox.com> wrote:

> (1) when instrument panel multi-pin connector below
>      the tach is plugged in, the fuel pump runs and
>      starter works, but engine just turns over without
>      catching.
>
> (2) with the multi-pin connector off, engine fires
>      right up.
>
> The connector and wires look fine (unburnt / no nicks / etc.).  The
> instrument panel ribbon cables look fine.  The switches are not causing
> the problem, neither is the speedo induction sender.
>
> I'm lost re. the wiring diagram and why an instrument panel short would
> prevent starting.  I see that a current track runs to the ignition
> switch, but wouldn't a short there cause the fuel pump not to run?  This
> is on a 1990 GL.
>
> Best,
> d.
>

--
Neil n

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