Who has their battery in the trunk?

wondering where you put the ground???.... my friend ran a tempory ground under my hatch by the spare tire until i can get a longer cable, but after taking my solid motor mounts out and putting poly's in, the car wouldnt crank over... need to fid a new ground since it wont work nomore now that i dont have solid mounts.. thanks
 
it dont HAVE to be grounded to the motor??? the reason im asking is.... how come as soon as swapped motormounts to polyurathane, there was no ground...

as a temporary fix, i ran a thick wire from the fender onto the motor and then it was grounded again and worked..