Hello All! And Happy Holidays.

What a day...I've got an 89 Volvo 740 Turbo and I have been trying to install a Saab APC system. Anyway this morning I was heading to grab a friend, and go to the junkyard to try to snag a good solenoid for the APC system. I drove down the street, and went to pull out on to a main road, as I went for second, the tach dropped, and the car died. I pulled it over, turned off the power accesories (its cold up here!) and did an underhood inspection. Everything looked good, so I jumped in hit the key, and it fired right up. I noticed that when I was coasting to the side of the road all the lights on the bottom of the dash had re-lit so I thought maybe I hit the key when I was turning (I've done it on other cars). So I ran up to his house...about 4 miles away, pulled in, shut it off, he jumped in it started right up. Headed back out made it about a mile and I was about to get on the onramp, and the car lost power, tach at 3k so I put the clutch in, and it dropped to 0 as I expected. I pulled it over, and started the diagnosis. No spark at all. Checked power to the coil by using the dome light bulb and got nada. So we called his parents and had them come pick us up. I got on the FAQ and got to thinking it was the power stage amplifier. So we went back down to the car with his 740 as a referance point. I jumped in and wanted to do the Hall Sensor quick test- well it fired right up and idled perfect. So I had him follow me all the way home (4 miles). I drove around the block at varying speeds, waited for the mail man to move, pulled in, and let it idle. Everything was good. I shut it off, and it fired right back up. So I parked it and went to the yard with his car to find a power stage amplifier. I came home and tired to start it to move it closer to the light in the garage, and its dead. I replaced the PSA with one from a 1990 B230F 740 Wagon at the yard, its got lots of the thermal grease on the back...nothing at all...compleatly dead. I get a tach jump when I turn the key on, but I can't seem to see anything when it is cranking.

HELP!?!?! I'm worried its a Hall effect sensor- but I want to deny it... Could the APC system have a bearing? I didn't do anything except take an RPM signal off of the coil... Oh and I used keyed power from the #12 or 13 fuse hot side...But I have since disconnected all of that...

Thanks in advance,
Tim