Join Date: Nov 2008
Location: Salina, Kansas
Feedback Score: 0 reviews
Diodes can and do wear out. The regulator stuck on full charge, it happens from time to time. the old regulators with the two separate coils, and contact points were real bad about that, but I've seen it happen with the solid state ones from time to time as well. You can replace the regulator first, then a little later the alternator without doing any damage...if you don't let it go too long. The regulator overloading the alternator like that will eventually short it out. Diodes, brushes, and bearings are surprisingly cheap, and most rebuild shops don't overcharge to rebuild one either. If I have the time, I usually go that route on everything I own.
1993 F-350 crew cab non-turbo 5 speed transmission
35 years a mechanic on large stationary engines natural gas and diesel fired, and other industrial equipment.