Does anyone know if the viper ROM works on the gsm viroesn? Also, I have never done this before if you do it and don't like it can you go back to factory setting?

if your car dies out as soon as you remove the caebls your alternator is dead but to answerer your question it wont hurt a thing but the other guy is right you could charge the battery you could always take the battery out put it in your other car and jum