Put VOM or DVM across batteries, should be 13.8 to 14.5 volts with engine running. If not, then bad alternator or voltage regulator (possible bad battery).....regulator usually part of the alternator. Just replaced Alternator in my car....$275. Rook
When you get a chance to dance, or sit this one out......I hope you DANCE!
98 National Tradewinds 7370, powered by a 3126B 300HP CAT Turbo, Freightliner XC chassis