Help Starting Dead X5

[donmayor]

Hello,

i purchased a dead x5 4.4i thats rained in from the sunroof been left open. I tried to jump it from the front, and the interior lights won't even come on. When i tried to jump it from the trunk, the interior lights will come on, seats, radio, everything work, but it won't start. everytime i turn the key, i hear a click in the trunk area and nothing.

Any ideas to help me start this car?

thank you,
DoN