My 99 Explorer had been running fine. Tonight I left my lights on, killed t he battery - which is about a week old from Walmart. Boosted it with anothe r battery I have that happens to be good. Car fired up but the connection n ut with the rubber boot at the top of the alternator started glowing red ho t. Obviously can't run it like that.
Any ideas what's happened? Never encountered this before.
Thanks.