so i have been having some trouble with my head/tail lights..... for some reason when i turn on the head lights the tail lights dont work....but when i turn on the running lights the tail lights are on...i was checking wires and i found that the main ground on the battery was very loose witch would let the car start at times..... swo i fixed that and the lights worked good for about 3 days and now they stopped again?? has anyone had this problem? what should i look for in fixing this???

headlights on- no tail lights

running lights on- tail lights on

turn signals-brake lights head lights-tails are all good just not working when supost to....

 

Check the combination light switch (see below). By the way, Danomatic93 has posted a nice DIY for cleaning/repairing this switch.

 

the switch is bad or wut??? need replaced or just cleaned?? how do i do that if its possible?

 

Start by using your multimeter to do the continuity tests on the switch (see diagram).