Solution to Both Turn Signals Flashing at the Same Time w/ the 7-Way RV Upgrade Kit ETBC7
Updated 12/22/2025 | Published 10/12/2024
Question:
I have installed ETBC7L on my 2023 Subaru Outback to convert from 4 to 7 pin. It was working great until today, when I turn a left or right turn signal BOTH lights on back of my trailer are blinking. What should I check/do to solve this problem? Thanks
asked by: KN
Expert Reply:
That definitely sounds like a grounding issue. You'll want to start by checking the white wire on the 7-Way RV Upgrade Kit item # ETBC7L. It should be securely attached to a bare clean piece of metal. If that ones good then you'll want to move on to the one attached to the 4-way connector. There's also one that'll be attached to your trailer's 7-way connector. One of these is probably lose or there could possibly be a cut or fault in one of them.
Product Page this Question was Asked From
7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires
- Accessories and Parts
- Trailer Brake Controller
- Installation Kits
- etrailer
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on Accessories and Parts
Jerred H.
12/22/2025
Hey, did checking the grounds on your ETBC7L wiring fix the turn signal issue on your trailer? Knowing what you found could help others track down similar problems. Your update could make it easier for the next person troubleshooting their lights.