WELL FROM WORKING ON THESE MOTOR'S FOR SOME TIME, YES SOME DO HAVE CHARGING SYSTEMS ON THEM AND SOME DONT. THE OTHER THING I DID NOTICE IS THAT YOU NEVER SAID HOW BIG OR SMALL THE MOTOR WAS. OR HOW OLD THE MOTOR WAS. OR HOW OLD THE BATTERY WAS. BUT, FROM WHAT I HAVE GATHERED, YOU MOST LIKELY HAVE A CONNECTION PROBLEM, EITHER AT THE BATTERY OR IN THE WIRING. MOST MERC'S RARELY HAVE PROBLEMS WITH THERE CHARGING SYSTEMS, BUT WHEN THEY DO ITS NOT HARD TO FIGURE OUT.................SNIPER GONE