No, not normally. Attaching the 24V battery to the 12V battery could easily cause the jumper wires to spark, melt, and probably explode the 12V battery. It’s very dangerous. You’d need 2 X 12V batteries connected in series to match the trucks 24V system safely and start the truck safely. This is if the 24V battery is made-up of 1 single battery, like those from Remy and many other companies out there.
