Travis, the turn signal bulb is grounded via the hose clamp to the steering wheel column, it is not a failure of the turn signal flasher unit if it doesn't turn on, it may simply not be grounded.
There may or may not be a CB in the flame heater circuit. Wire #55 comes from the accessory switch. Go ahead and leave it out (for comparison, the flame heater on my 757 8x8 has a 15A CB in the circuit).
Some ground connections:
1) Battery (NEG) to frame ( via cable)
2) Engine to frame (via strap)
3) Dash to instrument panel (via 1/4 turn fasteners)
4) Front lamp fixtures to fender (via mounting screws)
5) Headlights to frame (via wire)
6) Fuel in-tank pump and level sending unit to frame (via wire #79 )
7) Engine mounted items to engine (via treads or dedicated wire (flame heater return))
![Cool 8) 8)](https://www.steelsoldiers.com/images/smilies/icon_cool.gif)
Horn to steering column (via horn button)
9) Turn signal pilot light to steering column (via hose clamp)