Key takeaways
- Towed vehicle lights must match the motorhome signals.
- Diode kits, tow bar lights, and temporary lights are the main options.
- Some vehicles need charge lines or fuse bypasses. Follow the manual.
Why lighting matters
Your towed vehicle's own lights are hidden behind the motorhome's lights from the viewpoint of following traffic. Matching the signals prevents confusion and is required for road legality.
Common lighting methods
- Diode kit (hardwired to the vehicle's tail lights): uses diodes to isolate circuits so the motorhome's signals trigger the towed vehicle's existing lights. Installed in the towed vehicle, often by a professional.
- Tow bar lighting: some tow bars include built-in LED lights that plug into the motorhome and require little modification to the towed vehicle.
- Magnetic or temporary lights: removable lights placed on the towed vehicle. They are simple but must be set up each trip.
- Bulb-and-socket kits: replace a bulb with a dual-filament socket connected to the motorhome.
Tow bar with LED lights
If you want less wiring on the towed vehicle, consider a tow bar with integrated lights. See the Roadmaster Part #676 tow bar with LED lights.
Charge lines and battery protection
Some vehicles need power during towing, and some need a fuse removed or a battery protection device to avoid drain. A charge line carries power from the motorhome to the towed vehicle battery, and a fuse bypass switch lets you disable circuits that would keep drawing power. The vehicle manual sets what is required.
Connectors
The motorhome end commonly uses a 6-way or 7-way connector. If power is not available at the plug, an RV-specific charge line kit may be needed. Match the connector to your motorhome.
Test every time
Before each trip, test running lights, brake lights, and both turn signals with a helper standing behind the towed vehicle.
Frequently asked questions
Do I need a diode kit?
Only if you are using the towed vehicle's own tail lights. Tow bar lights and temporary lights avoid it.
Will wiring drain my towed vehicle's battery?
It can if circuits stay powered. Follow the manual and consider a fuse bypass or charge line.
Can I wire the lights myself?
Simple plug-in options are DIY-friendly. Hardwired diode kits often benefit from a professional.
This page is general information. Always follow your vehicle owner's manual, equipment instructions, and the laws of the states and provinces you travel through.