Turn Signal Problems with new LED bulbs

The truck is a 2008 WESTERN STAR 4964EX. I just replaced the stock fender turn signals with LEDs and also did the same on the back, when my headlights are on my passenger side blinkers will not work at all or will work in a very odd flash pattern. With the headlights off everything works fine. I cannot find the flasher relay to change that over to an Electronic relay. I've run out of options and ideas!!! Need help

 

The dealer said it is in the fuse panel but all it shows under "flasher" is a normal 20amp fuse

 

So far I haven't been able to locate the flasher relay for this truck, I've checked everywhere including tracing the "clicking" sound to behind the steering wheel in some control box under the dash but it doesn't have any access to it just a wiring harness that plugs in. One other weird thing that is happening, is that when my lights are on, the indicator arrows on the dash come on but are dimly lit. I'm at my wits end with this gremlin

 

I've looked and didn't know if I possibly had a unique issue, well where I had regular lights under the frame I replaced with a center plate then Mudflap hangers with the lights in them. It looks like I'll probably need those resistors. Where would you suggest I put them?? On the main wire running to the back before it gets to any lights or put one inline on each fender light in the front then on each line to each light set on the back?? I definitely appreciate the advice so far