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They're better at preventative maintenance. I wouldn't place too much creedence in the hope that they will recover a battery that's already sulfated.

If your truck sits alot, they are worth it for sure. If the stuff gets driven regularly, not much help. I bought 2 of the 28V ones from Patano many year ago when he was selling them for $25. Never did install them. At that time I still had the M35A2C and tractor and both got driven alot so I...

Quite a few folks use 2 12 volt units and swear by that. I see advantages to it also.