Battery tender will not work if there is an excessive amp draw. That plug will get so freakin hot, and the green lamp will never illuminate indicating battery is at proper voltage. I bought a tender for mine cause the battery was dying after a week or so if sitting. I thought the plug was gonna start a fire ! Then i found a draw caused by my voltage gauge. Fixed it, now the tender works perfectly .... But i can also leave my car sitting in the garage for a month untouched without a trickle charge on it, and it will fire right up ! Fix the draw then get a tender ...