I'm In the process of doing a swap and all sensors are disconnected of the engine but i got my self a custom box for my teg and i want to test it out. My question is it's ok to plug in the battery without killing my ecu.

 

Do it and lets find out.. lol j/k I think it'll be okay

 

If you're worried about frying the ecu then just unplug the ecu before you connect the battery.

 

has anyone done it without unpluging the ecu