76 F250 supercab
 

IHeatera 76 F250 supercab i turn on my right blinker my left rear blinker turn on as well as both of my right blinkers. All my running lights work and my brake lights work but I have no reverse lights. I just got the truck and it had a bad heater motor and i replaced the motor. The wiring for it.. The red wire off the motor i connected to the femaile plug going into my main harness and the other is a black wire that goes to my neg. Battery postI keep blowing Heater fuses I don't know why. somebody help me

Sounds like someone wired things wrong. All your wires go to the fuse block to make sure you have the right voltage to each item. Sounds like the blower motor is over loaded.

If you can do this ,
disconnect both wires from the blower motor or remove the blower motor completely.
Then take the motor over to the battery and try connecting the wires to the battery one to + and one to neg. The motor should run , if the blower blade/cage is attached you will note which way the output is going . Then try reversing the connections and see if the direction of rotation changes.
If you have a test lite or voltmeter determine which wire is positive coming out of the harness. You can try connecting them either way, but only one way will be the correct way. Some systems interrupted the hot side with the blower switch others chose the ground side . You can't always go by the colors of the wires.
Last , but not least try switching the connections , that might be an easier way to solve the problem.