Product Description
The Roadmaster 690 is a park light diode for flat towing setups. If the towed vehicle's headlights or parking lights are switched on while it's still connected to the motorhome, current can feed back between the two vehicles' parking light circuits and cause electrical damage. A park light diode stops that interaction by letting current flow in one direction only.
It's a simple add-on that protects the towed vehicle's electronics, especially if the towed vehicle has automatic headlights or the lights might be left on while hooked up.
Specifications
- Manufacturer: Roadmaster
- Part number: 690
- Type: Park light diode
- Rating: 24 amp
- Quantity: 1
- Warranty: Roadmaster lists a limited 1-year warranty
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.
Own this part? Be the first to review it.
Your experience helps other RVers choose with confidence. Tell us what you tow, how installation went and how it’s held up on the road.
✓ Takes about 2 minutes✓ Photos of your rig are a big help