grounding a blazer

[THENEWMEXICAN]

So I’ve been reading reply after reply about the importance of a properly ground electrical system and NEED some pointers. I bought a '70 Blazer with some wiring issues (nothing but the headlights worked) but after 4hrs in the truck I got all the lights to work... kinda.
Here is where I’m at:
1. The gauges work but not the backlights or indicators
2. Headlights, Hazards, Markers, Parking and Brake lights work or atleast turn on.
3. Only the passenger tail (light) turn signal works. (nothing else blinks) Hell, I don't even know what is supposed to blink when I flip the turn signal.
4. All fuses and bulbs are good. flashers too.

I guess I’m cleaning house on bad wiring and looking for some tips on grounding. And if anyone knows of a better set of wiring diagrams (all I have is the generic Haynes manual) I’d really appreciate the help. Getting the turn signals working by mid week so I could start looking for other problems is my goal. And is there reason i should start blaming the switch and not the grounds?