Urq missing with blinker on?!?

[Fluhr <ejfluhr@austin.ibm.com>]

Ok, before I went and fried my hall sensor, I was fighting a strange
problem with the urquattro.  When I turn on the turn signal, the
engine starts misfiring.  Ok, says I, the ecu or ignition module must
see a significant voltage drop when the turn signal is on...time to
check the power and ground wires. 

Of course, that is what caused me to fry my hall sensor, but I
still determine that all the voltage and ground wires were in
good shape.  Resistance on all ground wires was less than an ohm
or so, and I was receiving a solid +12v at the ECU, coil, and
ignition circuits with the car off.  I did notice a 0.3v drop
when the turn signal switched on, but that should be mitigated
by the +13.5v put out by the alternator.  All of the other ignition
and ECU wires are in good shape and have very little resistance
to them (where I could measure).  I have a pair of good solid
ground straps from the engine to the chassis, as well.  This
one has me stumped, since I do not see any correlation between
the turn signal and the ignition, aside from power/ground.

Any ideas?

Thanks,
Eric
'85 CGT, '82 urq
---
Eric J. Fluhr                                Email:  ejfluhr@austin.ibm.com
High End Processor Design                    Phone:  (512) 838-7589
IBM Server Group                             Austin, TX