91 fleetwood trunk wont close latch wont go up
 

ok so yesterday i had my brother and his friend install a sub in my car. everything worked yesterday no problems at all. (dont think that even matters) the trunk opened and closed just fine. woke up this morning and i used the key to open the trunk and it was harder than usual to open and when i opened it the latch wouldnt go up. when i tried closing it, it wouldnt shut at all. still doesnt. now im using bungie cords to keep it semi closed. wtf is going on? and wile im here, my gas gauge says d instead of the number of letters or gallons. any one know whats happening there?

edit: ok there is no power going to the trunk latch motor. any one have a wireing diagram?