My multimeter won't read over 10A max but it will give volts which should
show you where you're at. Rev the engine and put a load on the alternator by
turning on the lights. You should see the volts climb which means it's
probably OK. But since your idiot light is on suspect brushes or diodes. If
you have the time or another vehicle it's cheaper to look at repairing yours
rather than the FLAPS route. I have the same vehicle you do and inquired a
few weeks ago on the list about upgrading to the 90A alternator. Check with
Ken@VanAgain for details. Also I had a local Albuquerque auto electric shop
quote me $80 to turn my 65A into a 90A. Maybe double check your readings also
with a FLAPS or battery shop that has the big load tester and will test it on
the car for free.