http://www.jegs.com/i/JEGS-Performance-Products/555/10122/10002/-1?parentProductId=754001 After I put the dual cooling fans on my terra the gm one wire off the shelf at autozone just cannot keep up. I have dual group 31s so they are slow to charge back up. I haven't turned on my heat or attempted to use the winch, but with the headlights on and the fans running driving down the road the volt gauge won't climb past 11.5. Looking at the one I listed it puts out 140 amps at 850 rpm, which will be perfect for a diesel. Plus its got special fans that will help it cool idling down a trail all day long. Anyone use this one before? Thanks!