foward/reverse motor

Here is a circuit I designed for my amp rack but you can adapt it for your needs or at least give you an idea of what you need.

Relays 1 and 2 do the reversing while relays 3 and 4 cut the power when they've received signals from the limit switches. Relay 5 is a safety interlock which assures that the motor will not work while the trunk is closed. The 6 second timer and motor shown near the top left are used to unlatch the amp rack - just ignore it for simplicity sake.

I used a DEI 450R channel expander which has timed outputs to open and close which sends a continuous signal maxed to 60 seconds to relays 1 and 2 - obviously the limit switches stop the motor when the limit has been reached even if the 450R hasn't timed out. You may substitute the 450R with your ignition on/off signals.

A second alternative would be a DEI 529T which can control one motor in two directions and has a built-in current limit control. You still need to provide the required "ignition" control signals via relays.

Here is My design.

Or you can just use a switch Double Pole Double Poll.