Soooo we don't know wtf is going on...

REAR lights issues:
turn signals work
lights work
brake lights don't work
.... and when the headlights are turned on the passenger turn signal no longer works

FRONT lights:
right turn signal doesn't work and no idea why

grounds look good...
spent hours following wires....
*side note: does anyone know if the brake lights work off the tail lights or turn signal?

Any other helpful info would be greatly appreciated! Thanks!!

 

So this is a 1976 Pontiac with a 400 small block?

 

#1... make sure all of the bulb sockets and bulbs are clean of corrosion causing poor connections... use fine sandpaper, and small wire brushes with lots of contact cleaner to flush off corrosion, or replace if necessary... I have seen corroded sockets create all kinds of weird light issues

 

1978 dodge b300 with a 360 engine
haha i should've specified

 

thanks rsdata we'll check it out

 

I agree... Make sure it has all the rite Bulbs.. Check Grounds for sure...
But.. I think the problem is going to be the Turn Signal Switch.....

Just my 2 cents