Alternator decoupler failing?

sebtown

Member
Friday am 1000 miles from home I started the van, it sounded like a can of marbels and my ScanGuage indicated 11.2 volts and the battery indicator light flickered. Having no cell service and no choice I started toward the closest town. Within 1 mile the noise stopped and the volts shot to 14.2 eventually settling in at the expected 13.7ish. I decided to drive on toward a larger town and drove 500 miles without incident. Of course by the time I arrived the dealer had closed. I found a campground. Saturday morning I started the van and had the same noise, voltage drop and flickering lights. Again, within 1 mile, everything corrected itself. Feeling brave I drove the last 500 miles home without incident. The problem did not repeat itself upon start yesterday or this morning. The fact that it happened 2 days in a row and has not happened again concerns me. I'm going to replace the decoupler this week. Can these symptoms indicate something different that I may be missing?
 

wires

New member
Sounds like you have a problem with your alternator or alternator drive system!

While it's likely the alternator pulley I'd go ahead and do the belt, idlers and possibly the tensioner at the same time since the labor is about the same. When my pulley went out I replaced the alternator since a larger (higher output) unit was not much more than the pulley and tools to replace it.
 

sebtown

Member
Well I finally got into my problem yesterday and it was not the alternator. I replaced the idler, pulleys and belt and all is well. Don't think the idler pulley would have lasted another 100 miles. Color me both happy and fortunate!
 

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