no rear lights

[bd]

...it looks like maybe a hacked up trailer harness...

X2

[78C10 sleeper]

ok I did the check list

 with the negative lead on the volt meter on the BAT with head lights on and brake lights on
#1the pass side no voltage
#2 drivers side no voltage

#3
pass side both are hot
driver side both are hot
#4 with head lights off and left turn signal (drivers side light) on both are hot
with right turn signal on only one is hot (pass side light)
#5
no voltage or change on either side
#6
both grounds are clean and rust free I had to replace one a while back

also with the head lights off both the pass and drivers side blink at the same time. the front does the same. with the lights on all the rear lights are on (exept the back up lights) but do not blink front lights don't blink either
thanks for all the help guys

[bd]

Don't make any assumptions during the diagnostic process.  Be sure to follow instructions explicitly and answer questions the same way.  The process is drawn out, because we're addressing the problem "over the phone."  An electrician on site would have an answer within about an hour.  It's more difficult the way we're going about it, because instructions have to be interpreted then precisely executed, communicated and reinterpreted.  And, so it goes, back-and-forth.  Our responses are based on your responses.  Don't get discouraged...

• Look at the filaments of an 1157 or 1034 bulb.  One filament is heavier (thicker) than the other.  The thick filament is for turn/brake, the thin filament is for park/taillights.  Remove the lenses/sockets from the two front and two rear lamps, so you can see the filaments of all the turn/park bulbs while they are still inserted into their respective sockets.  Switch ON the park lights.  Carefully inspect each bulb and post by LF, RF, LR, RR which filament is illuminated at each corner of the truck.
  
  
• Now, remove the front turn/park bulbs from their sockets.  Is there any change in how the rear lamps function?
  
  
  • The rear turn & brake lamps started functioning correctly - There's a problem with the forward lamp bulbs, sockets or socket grounds.
    
    
  • The rear lamps function the same as before - There's a short in the wiring between the turn (or brake) and taillight circuits, or a short in the rear socket(s).