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19+ Ram 2500HD LF701 LED Headlight Turn Signal Relay Fix - Morimoto XB Headlight with Stuck Blinker

LF701 LED Headlight Turn Signal Relay Fix - Morimoto XB Headlight with Stuck Blinker 19+ RAM 2500HD

We here at HeadlightRevolution.com and the folks from Morimoto have been made aware of a problem affecting the Morimoto XB Headlights. Specifically, for the 2019 model year and newer, Dodge RAM 2500 Heavy Duty pickup. After some tests and research, we have found a solution at no cost to you.

Morimoto XB Ram 2500 1

Make no mistake, the Morimoto XB headlights are still the best headlight for your 2500 RAM (2019+). This is the LF701 that fits the 2019-2021 RAM 2500HD trucks and we learned that some of them have issues with the turn signals.

THE PROBLEM 

We received word from our customers that some of these headlights were causing issues with the amber turn signals. We learned that one or all the following problems with the LF701: 

  1. Sticking turn signal. 

  2. Flashing signal that remains on after the first flash. 

  3. Turn signal would not turn off once activated. 

  4. Turn signal would not turn on at all.

 Morimoto XB Ram 2500 5

After testing, we discovered that the relay harness and wire connector were to blame. The folks at Morimoto have teamed up with us to help you solve this issue. Regardless of where you bought your product from, Morimoto has offered a fix at no cost to you. This can be achieved by watching our video for a DIY experience, call Morimoto to let them know your issue, or you can send your headlights back to whomever you bought them from to have it addressed there.  

If you bought your headlights from us, be sure to check out the customer service page for assistance. 

THE FIX  

If you already own these headlights, prior to August 2021, this fix is for you. If you have purchased these after August 2021, then the problem is taken care of. We will get into the details on that soon. 

The first thing is to remount the relay so that it is mounted upright. This should theoretically solve the issue and you can do it at home. To take it a step further, Morimoto is offering a relay with improved water resistance. While it is not 100% waterproof, the new mounting position and potting material coating will help seal the relay. 

Morimoto XB Ram 2500 4

Lastly, we will be using dielectric grease between the connector and the relay as an added step for preventing water intrusion into the connector. 

The second issue being with one of the main multi-point connectors being open to the elements, creating an opportunity for corrosion. 

Issue No. 1 

The first issue we found with the LF701 Turn Signal circuit is with the relays. We found that the relay hangs upside down from the wiring harness, allowing for water to pool up inside the relay. This results in rust and the circuit sticking open or closed. Morimoto has used this relay on multiple models, however, on the RAM 2500HD, the relay was suspended upside down. Therefore, leaving it vulnerable to moisture retention. 

Morimoto XB Ram 2500 2

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Since the issue is between the connector and the relay itself, you need to grab the single relay and remove the tape that wraps around the relay plug.  This can be found on the rear of the headlight.

Morimoto XB Ram 2500 7

Once the tape is removed, separate the relay and connector. Before installing the new modified relay, apply dielectric grease to the female socket. Remember that there is no such thing as too much grease. Keep in mind that the more you add, the more of a mess it will make. We advise using no more than half a packet. 

Morimoto XB Ram 2500 8

Once applied, plug in the new relay. Push and pull the relay to ensure it is locked in tight. Next, use an alcohol wipe to clean the backside of the relay and the flat surface on the backside of the headlight. 

Morimoto XB Ram 2500 9

To mount the relay and ensure its position is correct, you can either use double-sided 3M tape or utilize a sip tie by threading the tie through the mounting point on the relay. 

Morimoto XB Ram 2500 10

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As long as the relay is right-side up, the rain should run off the relay without pooling up inside the relay. 

Issue No. 2 

The second problem we found was that one of the main multi-point connectors has an open hole. Depending on how it is sitting in the engine bay, water could get into it and lead to corrosion on the wiring pins. To fix that, we have a single, simple, plastic multipin connector plug. 

Morimoto XB Ram 2500 6 Morimoto XB Ram 2500 12

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Grad the plastic wire connector plug and slide it into the hole. If need be, grab a tool to push it further into the hole to close it up. 

Morimoto XB Ram 2500

That should solve the issue on your 2019 and newer Ram 2500HD. Remember, if you purchased these headlights prior to August 2021, this is likely to be an issue that you will face. Be sure by calling Morimoto to let them know your issue, or you can send your headlights back to whomever you bought them from to have it addressed there. It is important to get this fixed before it becomes an issue. If you purchased after August 2021, this problem has already been addressed on the Morimoto XB Headlights for the 2019+ Ram 2500HD.

For more information, be sure to check out the full video on how to complete these fixes. While you are there, make sure to like and subscribe to our channel for the latest lighting upgrades for your vehicle. Also, be sure to check out our range of options on HeadlightRevolution.com. 

Have any questions about one of the products we mentioned? Contact us today, and our customer service team would be happy to help.