2015 ram 1500 model without led lights from factory. when first connecting to make sure they were functional, before i turned the engine on, all the lights seemed to work. when i turned the engine on the C bar stopped working but the other lights were ok. turn engine off, C bar not working. i disconnected the negative battery cable for 20 secs, reconnected, and before cranking the engine, C bar and all lights were working again. as soon as the engine was turned on again, C bar goes out, brake and turn signal work still. disconnect battery again, same story. i tried one at a time, both together, tried flipping the connector to see if polarity was an issue. no fix. i really like the look and fit of these so im sad they must have some compatibility issue i assume. not sure what the problem is. looks like another reviewer had the same issue. seller appears to have accepted them back for a full refund as they were still in perfect condition so that is why i am giving a 5 star rating. i ordered the anzo 311274 lights and so far they work perfectly after a week.