It could very well be that the resistive load presented by the standard incandescent (Halogen) headlights produced a lower current draw across the headlamp circuit vs. the aftermarket relay (lower resistive load).
From the threads I've read over the years, many add-on HID kits don't appear to work as a simple plug & play (flickering headlights, or intermittent operation). Often resistors are put into the circuit to mimic the load of the Halogen 55W lamps.
The factory programming for HID lights likely has a different load since the circuit is now powering a ballast rather than the filament itself for the Xenon bulb setups.
Depending on the model, there are different electrical architectures - the LX/LY/LC cars have one setup, but it can vary from the other models/lines, and what may work in the Ram trucks and Jeeps can be something very different, or changes in model years.
There's different bus speeds, and Canbus setups can be different as well...how the TIPM is programmed for each vehicle/model can have its differences as well.
2009 R/T 27J pkg (6 speed MT) ordered 7/17/08, built 10/23/08, home on 11/13/08
Got it back from the dealership, they said it was a loose connection that caused the TIPM to blow. The technician got the HIDs working by connecting the power wire to an open fuse on the new TIPM and he said this won't cause any problems.
Mods: Slammed on BC Coilovers - Plastidipped wheels - Flowtech "RedHot" glasspacks w/ resonators removed - Sequential taillights - 20% tint all around - Hurst shifter - Apexcone 6K HID Headlights 10k HID Fogs - personalized license plate "6 SPEED"
Hopefully if it does they will stand behind their work
2010 Plum Crazy SRT8 with Manual Transmission-------
Mods list: K&N Typhoon CAI, Skip Shift Eliminator , Petty Strut Tower Brace, Diablo Predator 91CAI tune, License Plate backup camera with Lockpick V2, mini spare tire and adapter, Moroso Catch Can, some BT bling, 3rd brake pulser, Larry's mod Hurst shifter, coming soon Web Electric Sequential tail lights and LED under door lights
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