The reason for all the trouble is because I don't want to have the equipment draining the battery until I'm ready to do the uploading. No matter how long the delay on the empeg, it may not be enough if I don't get to it right away. I'm not sure what the maximum delay is on the unit, but having it and the access point on for many hours can't be good for the battery voltage. Plus I'd rather not have the access point running all the time while I'm driving.

Besides, its not really anymore trouble than hooking up a relay to the empeg's remote turn-om lead. I already have the alarm. I just connect the relay to the alarm's channel three output rather than the turn-on lead as you suggested. This way I have full control over what's running in the car and don't have to worry about running down the battery.