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Alternators can be intermittent. I have had several that run for a while and then have voltage regulation problems. I have seen them have high voltage and others go low after they get hot. Often times it is the electronic voltage regulator portion of the alternator. Other times it is the diode rectifiers that get funny when hot.
Measure the voltage at the alternator when it is having the problem. If it is less than 13.2v you can say for sure that the alternator is the problem.
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I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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