At 05:49 PM 11/20/2009, neil n wrote:
>So there's obviously something in the ECU circuitry that regulates
>and/or protects the voltage sensitive components from damage (within
>reason). Something similar to the Vanagon voltage stabilzer on the
>instrument cluster foil.

There is for sure a +5v regulator.  On Max Wellhouse's Bosch 025 906
022 (which has about 125 cracked solder joints I'm about to start
soldering, not counting the ones that Darrell or someone already
reworked a few years ago) there are four large three-legged
components clipped to the big heat sink.  I'd be fairly surprised if
one of them was not a +12v regulator.  That leaves one for ignition
drive and one for FI drive.

Yours,
d