wjw wrote:All the Prados I've seen are 12 Volts. But some have duel batteries, but still 12V
It would be a duel if the batteries were fighting with each other for the charge.
Anyway, a lot of people run dual battery system for the winch. As long as the batteries are connected in parallel, they will remain 12v. If you connect them in series, then you have 24v (not good if your electrics are all 12v).