76/c15 no rear lgts

[uct]

1976 c/15 no rear brake lights  or turn sign lights in rear  also no hazard lights in rear all front lights work as well as rear running lights Thanks for any and all help

[heavychevy91]

Inside your taillight is a ground for the rear lights. Check that as well as the connector on the rear crossmember.

[VileZambonie]

Check the connector for the rear harness.

[bd]

If the bulbs are good and the harness connections are good (as mentioned by Vile and heavychevy), check power into & through the turn signal switch.  Turn, brake & rear hazard all pass through turn switch before heading to the rear via one dark green and one yellow (or green with yellow) wire.  You can trace the wiring using the linked diagrams:

http://forum.73-87chevytrucks.com/smforum/index.php/topic,11766.0.html

[bake74]

     It is always best to check electrical issues by starting at the source of the problem and tracing back to power.  That way you keep it simple and organized.  Start with the lamps, see if they get power from the connector at the back of you truck as mentioned by everyone else.  There is also a connector for the back light at the fire wall.
     Important note, these beds were grounded sometimes by a grounding strap, make sure the ends are free of rust or build up that would cause it not to get a good ground. (the bed sits on rubber bushings so the strap is important to make ground )