[Jazzbass]

Word on old cars is that a glowing alt light at idle is somewhat normal - basically there is not enough excitation current to the alt at low RPMs. There is a fix that involves (I beleive) putting a resistor in parallel with the alt light to increase the current. All of this info is stuff I read on the board researching my own alternator issues, so take it with a grain of salt.

Now, I just got back from the alt shop with the POS Valeo alternator from my Carrera. It, too, had the alt light glowing at idle and it was pronounced DOA at the shop.

Try the resistor first and see if that works. If no, pull the alternator and have it bench tested. You could have a ground problem, but I doubt it as that issue wouldn't typically be RPM dependent.