I'm addressing a few electrical issues again on our 1979 F100. Currently, I do have park lights all the way around the truck, but no brake lights, no right turn signal at the front and rear, and no hazards at all.

Progress so far: the fuses are good, the turn signal switch was replaced in January with one from Dennis Carpenter, and the bulb in the right rear tail light is new.

When I engage the left turn signal, I can hear the flasher pinging under the dash, but not when I push the lever to indicate a right turn. The hazard flasher is also brand new, but this makes no noise when I turn the hazards on.

So, here are my questions:
1. What could be causing these issues?
2. What steps should I take from here to troubleshoot these issues?
3. Can I test the turn signal and hazard flashers to ensure they're working properly?

Any help is appreciated. Thanks!

 

The eternal answers - get a test light and check a) whether you have juice TO the sockets and b) check the ground quality at and after the sockets.
If you do not have juice to the sockets, start under the dash and find out where you are losing your connection: for instance, you replaced the switch: do you have juice from the switch to the flasher when you activate the right turn signal? Through the flasher? Through the wiring to the socket if you do have it out the flasher? etc.

 

You installed a T/S flasher instead of the 4 way flasher. Both look identical (round with two prongs), but the 4 way flasher is a heavy duty unit, has a louder CLICK.

The 4 way flasher was also used as the T/S flasher on Camper/Trailer Specials, dealers installed it for people that were deaf.