Yes, I will do Larry's test. The car is in another city, 200 KM from where I am now, but I have the alternator with me. I'll get back there next weekend to do the test. I need to wait 7 days before the CAA (similar to AAA) membership starts, so if it stops on the highway again, on the way back, at least CAA will tow me back to Toronto for free.

I pulled the voltage regulator, and compared the brush lengths to the new voltage regulator I have, and the old brushes have only worn about 1/32". I put the new regulator into the old alternator. I'll re-install the old alterantor next weekend and report back the voltage tests.

Also bought some 4 guage wire. If there is no continuity from the cable on the positive battery post to the B+ terminal on the alterantor, I'll slice open the insulation over the bulge, in case the bulge in the wire is a break or heavily corroded. If it's a break, I'll splice in the 4 guage and tape it up. The insulation on the original wire seems to be a woven cloth, maybe cotton. Also, I'll install a new alternator belt, the old one was glazed somewhat. I'll also take a complete new alternator with me.

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1989 420 SEL