Rcarradine wrote:You can jump start a 24V system with a 12V as long as the 12V system is in parallel with one of the batteries in the 24V system*. It may draw more from your jump starter, but should work. You can connect to both batteries as long as the 12V sources connecting to the batteries in the 24V system are electronically isolated from one another.
*If you're jumping a 24V system from a vehicle with a 12V battery that is connected to the vehicle, you want to connect to the first battery in series on the 24V rig (from GND to 12V and not 12V to 24V).
So jump the 12v good battery to only one of the 24v batteries? Pos to pos...and neg to neg?
So what about the twin 12v jump starters?
Attach first one pos to pos, neg to neg...then attach the other the same way to the second battery?