[MOSFET]

Hey Guys!!! How's it hanging? Now I know an awful lot about car audio and
the nature of voltage, amperage, watts, ect.

But I don't know much about the complexity of a car's electrical system and
that is EXACTLY the problem I'm having.

The car is a 1989 Mazda MX-6, it's my wife's car, and we recently had some
problems with it stalling, missing, and even dying sometimes. So after
doing all the things I know how to do (changing air filter, fuel filter,
plugs, wires, and several other things) I took it to a "shade tree" mechanic
who lives very close to us. I should say now that she had a simple system
in her car that consited of only a Pioneer HU and some after market BA
speakers (she listens to talk radio so there was really no point in building
her a big system, even though I have a spare amp and sub just sitting
around, I had to twist her arm just to put in the Pioneer and Boston
speaks), that system worked fine up until we took it to this mechanic.

When we got the car back, we found he had needed to replace the distributor,
cap, rotor, and coil. The car ran fine once again however the weird thing
is that the Pioneer deck no longer came on. So I took the dash apart and
started checking things with my multimeter (oh, I should say that the VERY
FIRST thing I did was check all the fuses which were fine). The B+ voltage
was fine, as was the ground. But the red ignition wire was reading .64
volts when the car was on OR OFF. So I said to myself, fine, I'll find
another 12 volt source that turns off when the key is turned off. I checked
the ciggarette lighter wire and every other wire I could find.

No dice. Although the yellow B+ wire seems to be fine, the ignition wire
(or any other wire that should produce 12 volts when the key is turned) is
only producing .64 volts whether the key is turned or not.

Help!!!! I've never come accross this type of problem before. Obviously it
has something to do with the car's ignition system (I think) but I have no
idea where to look for the fault. Like I said, the car runs great. Also,
again the radio had worked fine in the past using the red ignition wire as
my "turn-on" wire. Now only the yellow B+ wire is the only wire I can find
in that cavity that produces 12 volts, and of course it produces those 12
volts whether the key is turned on or not.

I really need some help here. Maybe even a work around as the car appears
to run just fine yet something is clearly wrong but does not seem to be
effecting the performance of the car.

Thank you in advance,

MOSFET