KrazyLegz
Junior Member
Howdy Everyone, I have been looking at older posts and trying to figure out what the common issue has been with my truck acting similar to others and totally different with others. Here is a rundown of the issues and what has been tested. 2017 1500 Big Horn with Halogen lights from factory. I ordered and was working on replacing all exterior lights with LEDs. I first replaced the headlights with Morimoto XB headlights with LED turn signal integrated. These are meant to be plug and play and they were functioning correctly when installed. I then replaced the fog lights with 4banger assemblies and they function properly. I replaced the mirror/puddle light with Morimoto sequential light and it too is plug and play and functions properly. I replaced the License plate lights with Morimoto assemblies and though they cause a glare on the backup camera, they function properly with or without the resistors. The problem arose when I replaced the taillights to match the rest of the truck, the taillights are Morimoto XB which are similar to the 5th gen LED assemblies. I installed the lights and checked everything without the truck running, and everything was fine. I started the truck and the passenger side park light would flash, then it would turn off and would notify me on the dash. I removed and swapped one at a time, the lights, the adapter harness, the resistors, left to right and the problem persisted on the passenger side. I installed the factory taillights and everything works fine. I put the truck back to stock besides the puddle lights, PITA/scary to remove, and only installed the taillights and they still do not function properly. After I contacted the vendor, they sent me another set of lights to try. I installed them on my truck and the same issue arose. I installed these lights on my in-laws 2017 1500 Laramie, with factory projectors and LED tails, and they function properly. I installed the same taillights on a 2014 with halogen tails and they function properly when the resistors are installed. This would have me believe the taillights, resistors, and adapter harness are not faulty. I re- installed all aftermarket lights again and everything worked fine even with the truck running, but only once. After I restarted the truck, the same issue returned on the passenger side taillight. I measured voltage at the connector and had 12.1V with the truck not running and IIRC 14.6V with the truck running, for a few seconds, the truck would then cut off power to the tail light. After this, I noticed the DRL (part of the new headlight if add a circuit is used) is more dim on the passenger side than the driver, at the same time, the fog light is dimmer on the driver side compared to the passenger, (looks more orange than a bright yellow). I forgot to mention when I installed all the connectors, I applied Dielectric grease to the connectors upon assembly, highly recommended by the vendor. I now have the truck with great lighting all around except for tails. Now the even more oddball issue, when I start the truck and let it warm up, the tachometer needle glitches 100-200 RPM for about 15 seconds. It also glitches when held at a steady RPM (1600 at 70MPH), I force a downshift and hold at 2500 RPM and the needle still glitches. Since lighting and instrument cluster would have you thinking they are unrelated, I found multiple posts talking about the BCM is in charge of controlling the lighting, dash, and many more systems. I have the factory lifetime warranty and have scheduled to drop it off on the 8th of January. Is there anything else I should have checked or should check before then? Is there a keyword or issue the dealership needs to hear to help them figure this issue out? I had to replace the headlights, not because they burnt out, but they were a terrible design which did not illuminate very well in the dark roads in Northern Nevada. Any input is greatly appreciated. I love the truck, it replaced my 240k mile '07 SLT with a 4.7L which was not as complicated as this one.
