ive recently had problem with my heater radio not coming on ive checked the ground busses on both sides they didnt look corded but i cleaned them anyways and it worked for a lil bit but not right after i cleaned them. on the driver side i snipped the ground buss off and tied all the wires together and still nothing. i examined all the wires they seem to be fine to my eyes. i noticed there is 4 sets of wires on the driver side each with a ground the bundle of wires with the skiniest ground turns on the interior lights whenever i touch them any of the other grounds.
i was wondering if anyone had suggestions or someone could tell me which bundle of wires are which so i could pinpoint the problem also it seems like my fuel filter or pump is bad but doing some research says its most likely the ground i just wanna get that fixed before i drop the tank. fuel filter isnt hard to check ill look at that in about 5 mins

Moved to electrical for better visibility.
Mike1995

Zane...

Get a DMM (digital multi meter) and check the continuity of each one. If you've gotten water inside the car, of any valume; you may have to pull the seats and carpet up. There are a couple of connections on the floor board under the seats that are susceptible to rotting out.

under which seat

is there any wiring diagrams under the seat was fine cant find my continuity tester