Turn Signal Malfunctioning..

[Z.Byers]

Here's my issue:

A few days ago when I was driving my '94 Ranger 4x4, the turn signals stopped working. I checked them out when I returned home and here is what's going on:

When headlights are off:

-Turning on left turn signal, All signals flash, including license plate lamps and dash lights. Left signal indicator on dash works as if they're on correctly
-Turning on right turn signal, functions just fine.
-Turning on Hazards, all four flash, including dash and license plate lamps.


When headlights are on:

-Turning on left turn signal, No flash from any of them, drivers front gets a little brighter, as well. Left indicator on dash stay solid.
-Turning on right turn signal, works correctly.
-Turning on Hazards, no flash from any of them, but fronts gets brighter. Indicators bulbs on the dash stay solid.

There were aftermarket LED taillights installed when I purchased it, and Halo Projector Headlights. I removed LED tails and used a normal bulb, and no changes in the above. I switched bulbs out of all four turn signals and nothing changed, as well. The projectors are not hooked in, nor are any other accessories.
It does have a towing package, and all wires there are properly connected. I also checked all fuses and none are blown. When I replaced a signal fuse with a higher amperage one, they functioned fine for a little bit, but now they are back to the above.
I also replaced one of the flasher, I need to pick up another and see if hopefully it's just one of those, but I don't believe that is the issue.

I know the next logical thing to do would be trace the grounds and see if any are shorted out, but I'm not very electrically inclined nor do I have a Voltmeter, so I am looking for another possible option

I am truly baffled as to what the issue may be. Any help would be greatly appreciated.

Thanks in advance,

Zack

 

[RonD]

Pretty much all the lights run through the light switch, that would be my first stop, a problem in there could affect all the lights.

Diagram of lighting system
http://www.therangerstation.com/tech_library/EDiagrams/files/Diagram_turn_stop_hazard.JPG

 

[Z.Byers]

I bought a new multifunction switch, and headlight switch, and neither one of those fixed the issue.
On the plug itself going into the MFS, if I remove the, orange and green wire, which leads to the left rear signal, the front flashes correctly and it appears as if the issue is resolved.

 

[Z.Byers]

Solved the issue, the harness for the trailer wiring was bad. Pulled it off and all is good again.

 

[RonD]

Thanks for post the fix, and good work finding the problem