My brother got my dad's '93 3.3L Grand Voyager given to him in '98 with about 130k miles. It currently has about 250k miles. I can recall 3-4 times in the past 1-2 years where the alternator belt has come off when driving on bumpy roads. A mechanic told him that this particular vehicle was notorious for having the belt jump off when driving on rough roads and during snowy or rainy/muddy conditions. I've never heard this one before! Why didn't my dad have the same "notorious" problem during the first 130k miles?! I know that he has a newer belt because it was replaced the first time that it fell off, and I put a new tensioner on it last summer. Any ideas as to what's causing the problem? Your opinions, as always, are greatly appreciated!
Rob