The OL (overload) error message on Tekonsha brake controllers like # TK94FR tends to suggest that there is a problem in your trailer's brake circuit wiring. You can start by inspecting both the vehicle and trailer connectors for any signs of corrosion or trapped dirt that could cause two circuits to become bridged together. Check both sides of each connector and clean/replace as needed.
Also check the trailer's entire brake circuit wire from the trailer connector all the way along the... view full answer...
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