Roadmaster
Roadmaster 789 Set of 2 Smart Diode fits RV to Flat Towed Vehicle Connections with Variable Voltage and LED Lighting | Easy Installation | Aluminum Heat Sink | Epoxy Case
Roadmaster 789 Set of 2 Smart Diode fits RV to Flat Towed Vehicle Connections with Variable Voltage and LED Lighting | Easy Installation | Aluminum Heat Sink | Epoxy Case
SKU:R6L789
In stock
Couldn't load pickup availability
- Genuine brand-name parts
- Ships from US warehouse
- 30-day returns
The Roadmaster 789 is a set of 2 smart diode. It is a new, genuine Roadmaster product with the manufacturer warranty, shipped from the closest US warehouse.
Key features
- Product Compatibility: Roadmaster Smart Diodes fits RV to Flat Towed Vehicle Connections with Variable Voltage and LED Lighting
- Set Information: This set of Roadmaster Smart Diodes for RV to Flat Towed Vehicles Connections contains 2 diodes
- Cool Design: The Roadmaster Smart Diodes are constructed with aluminum heat sink to prevent overheating or failure
- Built to Last: The Roadmaster Smart Diodes are encased in epoxy to protect them from the harsh elements
- Made in the USA: Premium products, handcrafted by American workers, Roadmaster is a true American manufacturer that builds its products to last
Product details
Diodes are used to prevent the backflow of current to the electrical systems of the towed vehicle and RV. Without them, backfeed can destroy the computer module in either rig. Some newer towed vehicles use a multiplex wiring system, whereby multiple electrical signals may be sent down a single wire (brake and taillights, for example). The signals only vary by voltage. This is why Roadmaster often refers to these vehicles as having variable voltage lighting. If an ordinary diode is used in these applications, some taillight signals will not work. That's because the motorhome only sends 12 volt signals, but the towed car is expecting different voltages for different taillight functions. Smart Diodes receive the full 12 volts from the motorhome and modify the voltage in order to light up the correct taillight signals on the towed vehicle. Because Smart Diodes correctly modulate the voltage to activate only the intended circuit, the result is vehicle lighting that looks and functions as intended. Even if not required, they can still be used in place of regular diodes. This is beneficial as only 2 Smart Diodes are required per vehicle (traditional diodes require 4 for most vehicles).
Specifications
| Brand | Roadmaster |
|---|---|
| Manufacturer part number | 789 |
| Part type | Auto Accessory |
| UPC / GTIN | 758306321373 |
| Weight | 10.00 lb |
| Dimensions (L × W × H) | 10 × 10 × 10 in |
| Category | RV & Camping |
| Condition | New — genuine brand-name product |
| Warranty | Manufacturer warranty |
Questions
How fast does it ship?
Orders ship from the closest US warehouse, normally within 1–3 business days, with tracking by e-mail.
Is this a genuine Roadmaster product?
Yes — new and genuine Roadmaster, with the manufacturer warranty.
Can I return it?
Yes. Unused items can be returned within 30 days — see our refund policy for the details.
Shipping & delivery
Shipping & delivery
Orders ship from the distributor warehouse closest to you, normally within 1–3 business days of purchase. Standard ground delivery takes 3–7 business days in the continental US; expedited options are shown at checkout. Oversized items (bumpers, running boards, large tonneau covers, some marine equipment) ship LTL freight — we contact you to schedule delivery and a signature is required.
Returns & warranty
Returns & warranty
Unused, uninstalled parts in original packaging can be returned within 30 days of delivery. A restocking fee of up to 20% may apply depending on the product and supplier, and return shipping is the buyer’s responsibility unless the item arrived defective, damaged or incorrect. Every product carries the full manufacturer warranty. Contact us with your order number to start a return.
Fitment & part numbers
Fitment & part numbers
Verify fitment with the manufacturer part number shown above and your vehicle’s year, make, model and trim. If the listing says “Fits select…”, confirm your exact application before ordering. Not sure? Send us your VIN and the part number and we’ll check it for you.
