I purchased 3157 style (blade) LED replacements to upgrade my 2001 Ram 1500 and 2001 300M rear lighting. I'm having the same issue with both vehicles.

When replaced with LED's, I have functioning brake lights (and turn signals on the Ram) on both vehicles, but the running lights do not work on either car. If you flip the bulbs to reverse polarity, then the LED's don't work at all. Is the Mopar harness not compatible with LED's? Is there any fix?

Thanks!

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph