My 1997 Venture with 98K miles has experienced repeated alternator failures.
The vehicle has the Valeo 105A alternator. I replaced the original unit 2
years ago with one from Napa. It lasted until January 2007, though I
experienced problems well before I replaced it. The problem is most evident
when I first start the vehicle, it runs fine and there is no belt noise.
Then 20-30 seconds later, the belt begins to sequel. When you increase the
rpm's, the belt sequel gets louder until the sequel ceases. Then you will
not hear the sequel the rest of the time the vehicle is running. I know
that the belt is slipping on the alternator...you see rubber shavings on the
face of the alternator, around the pulley. I then installed a new
alternator in January and it showed signs of failure so I replaced it last
week. The alternator showed a I/F failure, though I believe that it was an
intermittent failure, because I had to have it tested again before I was
given the replacement unit, the test showed that it was in good condition.
With the new alternator, I only use it for a few days, when I again heard
the belt sequel noise. I have not driven the vehicle since.
I cannot seem to figure out what is causing the alternator to behave in this
way. I checked the ground connections and I believe that they are solid. I
have a new battery and a new belt. The tensions looks to be good....it
takes plenty of force to move it out of the way to install the belt. The
belt routing is correct as well. Is there a connector (other than at the
alternator) that may be corroded, that could be causing this problem. Any
assistance is appreciated....I'm stumped on this one. Thank you, Joe