Product Description
The Roadmaster 153789 is a towed-vehicle wiring kit with Smart Diodes, for towed vehicles with LED taillights and variable-voltage lighting. It connects the towed vehicle's own turn, brake and running lights to the motorhome's signals while flat towing, and the diodes prevent current from feeding back into either vehicle's electrical system.
On many newer vehicles, one wire carries more than one lighting signal at different voltages. Ordinary diodes can't sort those signals out, so lights may not work correctly. Smart Diodes adjust the voltage so only the intended circuit lights up. Each vehicle needs two Smart Diodes, and this complete kit includes both, a 27-foot harness and the supplies to finish the install.
Vehicles with standard incandescent taillights need the incandescent version of this kit (Roadmaster 153782). If you're not sure which your vehicle has, contact us with the year, make and model.
Specifications
- Manufacturer: Roadmaster
- Part number: 153789
- Type: Towed-vehicle wiring kit with Smart Diodes (hardwire)
- For: LED taillights / variable-voltage lighting
- Harness length: 27 feet, 4-wire
- Estimated install time: About 2 hours
What's Included
- 2 Smart Diodes
- 27-foot 4-wire harness (white wires)
- 10-12 gauge yellow butt connector
- 3 ring terminals
- 3 feet of split loom
- 11 wire ties
- Tek screws
Helpful Links
Pro tipWiring and battery tips
- Protect the car’s wiring. Diodes or a separate bulb kit keep the motorhome’s lighting signal from feeding back into the towed vehicle’s electrical system.
- Watch the battery. Some vehicles drain their battery when flat towed; the owner’s manual will say whether you need a charge line or battery disconnect.
Not sure what fits? Send us your vehicle — we’ll confirm before you order.
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