So, on my 92 D250 Cummins Diesel the alternator was not charging properly. Only showed 12.3 volts. So what do we do? We replace the alternator. Well same issue only 12.3 volts from the alternator. After further investigation I find that the regulator for the alternator is internal to the PCM or ECM. Apparently this is a common problem on these trucks and the PCM also controls the transmission overdrive, the speedometer, the air conditioning ,and more. I would have probably just bought a rebuilt PCM but they are unavailable. Apparently must send yours into somebody and have them rebuild it. But after some further research I found out that a guy on YouTube, interestingly enough, shows you how to repair it. So here it is I've got it apart. Ordered some capacitors for it. We'll fix it in a few days. And see if that works. Always an adventure. But that's how I like it.
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