Troubleshooting LED Trailer Light Issues Only When Connected to Motorhome

Updated 07/09/2020 | Published 07/07/2020

Question:

have 2 year oid box trailer with led lights everything works as should behind my 2015 Ram hook it to my 2004 Fleetwood mtr home only have marker lites on sides and top no tailites, start motorhome and marker lites go out with running lites off turnsignals work with motor not running donot work with motor running motorhome has 2 tailites on each side both are duel element bulbs previous owner put new headlite assemblies in been all over grounds ran temp additional grounds at wits end do i need resistors n lites?

asked by: Jim

Expert Reply:

Because you know the trailer works correctly when connected to your Ram, the issue is likely in the connection between your Motorhome and trailer. The way you describe your motorhome impacting your trailer lights in different stages of being on and off etc, leads me to think because your trailer has LED's you will need load resistors as not enough power is being drawn at the trailer connection. My recommendation is to simply use the Trailer Connector Adapter w/ Lamp-Out Sensor Bypass - 7-Way RV to 7-Way RV - Vehicle End # 20142. This adapter has built in load resistors to make sure your trailer with LED lights is functional when other parts of the system pull power away from that connection.

expert reply by: Jason S