don't think you can - unless you set up a dedicated battery for the radio that kicks in when you disconnect the truck battery, and it needs to be "instant", even a minute without power will lose the presets

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics