You have a Leece-Neville part # 79000 voltage regulator. Verify your voltmeter is not lying to you. Go online eBay and query 79000 voltage regulator. Transpo brand HD model is good. These are flat compensating regs so LN decided. No temp adj slump. LN brushes for the 2500 series JB units are long. I never liked OEM 79000 regs so I used Transpo with good luck. DO NOT use a reman alt as they are JUNK except for the Prestolite Leece-Neville remans available at big rig manufacturer's parts counters. Stick with Transpo for regs and OEM for new or reman units.
