Grounds on a 71 c10???

[klwebb]

I've got a 71 c10 longbed w turn signals that don't work. I've read and heard a lot about the grounds but I don't know where they all are or where they connect? The headlights, brake lights work. The reverse lights aren't installed yet so not sure about those. Please help! This is the last thing I need before I take it to emissions. I've replaced turn signal switch and the fuses on the fuse box.