Hi I need to install a relay harness for my HID's but the battery is in the trunk. I know there are some spots to ground the car in the engine bay but I can't figure out where I can hook up something to the Positive pole of the battery... I can't just run a wire going from the trunk all the way to the engine bay that wouldn't make sense...

can anyone help me?

 

if memory seeks to serve, between the airbox and the brake fluid reserve you should see a small black flap with a + on it.. pull it up and there you go, +ve pole...

 

+1. Memory serves.