2003 GMC SAVANA 3500 Engine And Engine Coolingcooling System Problems

VAN WAS BEING DRIVEN EARLY MORNING FOR ABOUT 30 MINUTES. NO RAIN, 45 DEGREE OUTSIDE TEMP., HEADLIGHTS ON. DRIVER FIRST NOTICED DASH LIGHTS FLICKER & ALTERNATOR GAUGE SHOWING A DISCHARGE, THEN THESE ISSUES RETURNED TO NORMAL. THE VAN CONTINUED BEING DRIVEN FOR 15 MINUTES TO DESTINATION W/O FURTHER ISSUES. UPON DEPARTING VAN, DRIVER NOTICED UNUSUAL SMELL AND WAS TOLD BY ANOTHER PERSON THAT SMOKE AND FIRE WERE COMING FROM UNDERNEATH THE VAN AT ABOUT MIDPOINT. UPON INSPECTION THE DRIVER SAW FLAMES EMANATING FROM SAID POINT UNDERNEATH THE VAN AND LIQUIDS ON THE GROUND. EMERGENCY CALL TO THE FIRE DEPARTMENT WAS MADE & A THIRD PERSON BROUGHT A FIRE EXTINGUISHER TO THE SCENE. FIRE WAS EXTINGUISHED BUT REIGNITED AS THE FIREMEN ARRIVED TO COMPLETE THE JOB. VEHICLE NOT SEVERELY DAMAGED AND NO INJURIES. VEHICLE WAS TOWED FOR INSPECTION. DISCOVERED THE ALTERNATOR CHARGING WIRE TO THE BATTERY HAD NOT ORIGINALLY BEEN SECURED...