LED fog lights

[Tim K]

I replaced the bumper on my 2019 Ram 1500. The new bumper came with led fog lamps. I reversed the polarity on the connectors but I don’t have lights. Am I missing something? Thanks in advance.

 

[rossagge]

I replaced the bumper on my 2019 Ram 1500. The new bumper came with led fog lamps. I reversed the polarity on the connectors but I don’t have lights. Am I missing something? Thanks in advance.

Did the truck originally come with LED fog lights?

 

[Tim K]

Did the truck originally come with LED fog lights?

No

 

[rossagge]

There's your reason why. The CANBUS or wiring is different (something to that effect). There are companies that make harnesses in order to make them compatible. Also, not 100% positive, but if you have Alpha OBD, there might be a setting in there to make them work. When I ordered LED tails for my HD, it originally had halogen, I needed a harness to make it compatible.

 

[Tim K]

There's your reason why. The CANBUS or wiring is different (something to that effect). There are companies that make harnesses in order to make them compatible. Also, not 100% positive, but if you have Alpha OBD, there might be a setting in there to make them work. When I ordered LED tails for my HD, it originally had halogen, I needed a harness to make it compatible.

Right, but I thought the only thing the harness did was reverse the polarity? Maybe I’m wrong.

 

[rossagge]

Right, but I thought the only thing the harness did was reverse the polarity? Maybe I’m wrong.

I did see some DIY harness on this forum I believe, but for the tail lights. I'm not sure how much different it is for the Fog Lights. You can reach out to them to inquire. 5th Gen Ram

 

[Tim K]

I did see some DIY harness on this forum I believe, but for the tail lights. I'm not sure how much different it is for the Fog Lights. You can reach out to them to inquire. 5th Gen Ram

Thanks, appreciate the input

 

[Tim K]

For anyone who stumbles across this, I did not need to reprogram anything. Switching the polarity worked just fine. It did take a couple of sleep cycles for the lights to function. It is not an immediate thing, but just reversing the wires works just fine.