Hello! I bought a used 2005 Scag TT this spring. The old owner just replaced the battery. I ran most of summer, then it wouldnt start. Battery was DRY - needed tons of water. I replaced battery with another new one and it started right up! BUT, I then checked the voltage across the battery - its 17.5V Is my voltage regulator definitly the problem here?? I hate to spend $200 and find out I missed the problem! Thanks so much!!