Let me get this outta the way first. We own a 3G and 4G with their own little set of problems, but this problem is on a 2006 International 9400i. I'm posting the question here because I've seen some really helpful answers and solutions on the site. I'm installing aftermarket marker lights/blinkers. I spliced into the oem wires, which run to a 3157 socket. Today I got 2 load resistors and installed them. I have 2 wires- white, yellow and brown. I spliced into the brown which is ground, and yellow which is the signal light. White runs to marker/ constant power. Before I put the load resistors on, I had marker lights and flashers, but no turn signals. After installing the resistors, I have running lights, flashers, and signals BUT, the signals will not flash when the marker lights are turned on. All 3 functions will work individually, but being on a commercial vehicle, I'm kinda required to have everything working properly. I've tried swapping the wires around and their definitely correct. What am I missing or not doing right for the turn signals to stop when the running lights are switched on? It's also showing a bulb burnout on the dash display when it does this. Would taking the resistors off and swapping for a no load flasher fix it?