Mack Anthem front turn signals/4-way flashers not working need help please

[Rich Banwait]

So my front turn signals on my 2020 Mack Anthem are not flashing. The thing is they will work with the headlights switched off but flash rapidly and as soon as i turn the lights on they will not work. Any help would be greatly appreciated Thank You!

[Zach Wright]

Did you ever get this fixed ? I have one doing this exact thing. 

[Jwiningar]

This is exactly what my truck is doing on the driver's side.  The passenger side is working fine.   Did anyone find a solution?

 

I replaced the headlight bucket (not the headlight module) with no luck.  The new light did exactly the same thing.   I took the truck to the shop, it turns out the headlight module is bad.  The headlight was lighting up just fine, but it wasn't sending the current to the turn signal/dlr light.  

Edited November 30, 2023 by Jwiningar
Found solution to problem

[Mackpro]

In the PI,AN and GR’s (Pinnacle  , Athem and new stlye Granite  ) they now have the light control module LCM that controls all the lights. In the fuse box on top of the dash , check all fuses labeled LCM There could be as many as 7. These trucks now have 2 separate hood harnesses one for the right side and one fir the left. I have see a few passengers side Athem harnesses rubbing and shorting just behind the connector at the hood on the chassis side of the connector.