Originally Posted by sangamon

Both my Unimogs and my M656 are 24 volts. I use a little 24V/12V converter for things like my laptop computer, GPS, and stereo.

I needed a jump start once on one of my Unimogs. We just put the 12V jump to one battery for a few minutes, then to the other battery. We removed the cables when starting. We were very careful about grounds and connections, and it worked fine.

As far as cold starting, it doesn't get into single digits very often here in Seattle or Blaine. The coldest I've started is about eight degrees. Instead of starting in one second, the engines took about three seconds. The 24v starter really spins the engine.