2007 Freightliner Coronado electrical issue.

Hello everybody, on my 2007 freightliner Coronado the blinkers stop blinking whenever I turn on my lights(marker only or marker and headlights). They work completely fine whenever the lights are not on. This is only bobtail, I haven’t tested it with a trailer (I will tomorrow). I’ve checked all the grounds and they all seem to be good. I’ve checked fuses and the relay and it’s fine. When my lights are on and I check the trailer pigtail voltage for blinkers it’s about 3 volts.

What else can I check and how can I solve this problem? Anybody have any idea?

 

Yes. I’ve tried disconnecting every light one by one and I cannot seem to find the short. Today my right blinker worked for a short while and my left blinker was just not “blinking”. I literally didn’t do anything so I have no idea what’s happening.

 

They were working today.