February 17, 201511 yr So is there even a predictable life span for alternators? I still have the stock one and my rig has 166,600 miles on it right now. No signs its going out yet. But given the miles on it should I be wary?
February 17, 201511 yr They're cheap enough you can keep a spare one just in case. Hard to really give you any idea when it might go. Could last another 100,000 miles, or it could go next week, i'd say. Sometimes they give you warning signs beforehand, if you have a voltmeter, seeing erratic readings on that would be an indication. Any type of bearing noise would be another indication. Whines, loud whirring, etc. Like I mentioned though, they're cheap enough that it'd be no big deal really to just buy one and keep it in the car just in case. Also, even if it does just completely go dead while you're driving, you'll still be able to drive the car until the battery itself discharges.
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