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

There is a problem with the Morimoto XB Headlights, which we and the Morimoto people have been informed about. In particular, the Dodge RAM 2500 Heavy Duty truck (2019 model year and later). We've identified a solution at no cost to you after conducting some investigation and testing.

The best headlights for your 2500 RAM (2019+) are still the Morimoto XB headlights. However, we found that some of the 2019–2021 RAM 2500HD pickups, which this LF701 fits, have turn signal problems.

THE PROBLEM 

Customers told us that some of these lamps were interfering with the amber turn signals. One or more of the following issues with the LF701 were discovered by us:

1. A turn signal that stops.
2. After the initial flash, the flashing signal continues to exist.
3. After it was triggered, the turn signal would not go out
4. There was no turn signal at all.

We tested and found that the problem was with the wire connector and relay harness. We've partnered with the people at Morimoto to assist you in resolving this problem. No matter where you purchased your product, Morimoto has provided a free remedy. You can accomplish this by calling Morimoto to report the problem, sending your headlights back to the retailer to have them fixed, or viewing our video for a do-it-yourself project.

THE FIX  

The relay must first be remounted in an upright position. Theoretically, you can do this at home, and it should resolve the problem. Morimoto is advancing the concept by providing a more water-resistant relay. Although it is not completely watertight, the relay will be sealed thanks to the new mounting location and potting material covering.

As a final precaution against water infiltration into the connector, we will apply dielectric grease between the connector and the relay.

The second problem is that one of the primary multi-point connectors is exposed to the weather, which presents a corrosion risk.

Issue No. 1 

We discovered that the relays are the initial problem with the LF701 Turn Signal circuit. The relay hangs upside down from the wiring harness, which allows water to collect inside. The circuit sticks open or closed as a result of corrosion. Despite being utilized on several models by Morimoto, the relay was hung upside down on the RAM 2500HD. Thus, it is susceptible to moisture retention.

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.

After the tape has been taken off, disconnect the connector and relay. Grease the female socket with dielectric grease before putting the new modified relay in place. Keep in mind that too much grease is never an issue. Remember that the mess will increase with the amount of additions. We recommend using a maximum of half a packet.

Connect the new relay when it has been applied. Push and pull it to make sure it is securely locked in. Next, clean the flat area on the rear of the headlight and the rear of the relay with an alcohol wipe.

To install the relay and ensure it is in the proper position, you can use double-sided 3M tape or a sip tie, which you thread through the relay's mounting point.

If the relay is oriented correctly, the rain should flow off it without collecting inside.

Issue No. 2 

The second issue we discovered was an open hole in one of the primary multi-point connectors. The way it sits in the engine bay may allow water to seep in and cause the wiring pins to corrode. To address this, we have a single, basic plastic multi-pin connector plug.

Slide the plastic connector plug into the hole. If necessary, push a tool farther into the hole to shut it up.

The newer Ram 2500HD should resolve the problem. You may run into this problem. Make sure to give Morimoto a call and inform them of your situation, or return your headlights to the retailer and get them fixed there. This must be resolved before it becomes a problem.