• Demco Tow Bar Accessory Kit – Battery Charge Wire Kit, 12 Volt, With LED Display
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Demco

Demco Tow Bar Accessory Kit – Battery Charge Wire Kit, 12 Volt, With LED Display | 6857

Demco Tow Bar Accessory Kit – Battery Charge Wire Kit, 12 Volt, With LED Display | 6857

$59.90 USD
MSRP $61.39 USD Our price $59.90 USD
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Why buy from RV Towing Pros

  • Genuine new partsBrand-new Demco, never used or refurbished
  • Fit GuaranteeSend us your vehicle and we’ll confirm fit before you order. How it works
  • Ships in 5–8 business daysIn-stock parts; express available at checkout
  • Secure checkout & 30-day returnsPay with card, Shop Pay, PayPal and more

Questions? Message us — we answer within 1 business day.

Shipping & Returns

In-stock parts: standard shipping 5-8 business days, express available at checkout. Out-of-stock and special-order parts: 3-5 weeks. Returns accepted within 30 days of delivery (20% restocking fee; buyer pays return shipping unless we made an error).

Fit Guarantee: if you sent us your vehicle details before ordering and we confirmed fit, but the part doesn't fit, we cover return shipping and waive the restocking fee.

Questions? Message us — we answer within 1 business day.

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Product Description

The Demco 6857 is a 12-volt battery charge wire kit that runs a charge line from the motorhome to the towed vehicle's battery, helping keep the battery from running down while the vehicle is flat towed. This matters most when a supplemental braking system or other accessories draw power from the towed vehicle's battery during the trip.

The kit has a built-in LED indicator that lights when a complete circuit is established, so you can confirm the charging connection is working. It also includes diode protection to prevent current from flowing back and integrated fuse protection for the wiring.

Specifications

  • Manufacturer: Demco
  • Part number: 6857
  • Voltage: 12 volt
  • Indicator: LED, lights when the circuit is complete
  • Protection: Diode and fuse
  • Made in: USA

Charge line requirements vary by motorhome and towed vehicle. Contact us with your setup if you have questions about installation.

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Shipping & Availability

In stock and ready to ship.

Pro tipTow bar setup tips

  • Rating first. The tow bar’s capacity must be higher than your towed vehicle’s loaded weight.
  • Keep it close to level. Tow bar makers specify how far the motorhome hitch and the base plate connection can be apart in height — use a rise or drop receiver to bring them in range (see your tow bar’s instructions).
  • Check base plate compatibility. Different brands connect differently; mixing brands requires the right adapter.

Not sure what fits? Send us your vehicle — we’ll confirm before you order.

Our Fit Guarantee Tell us your vehicle before you order and we’ll confirm the part fits. If we confirmed it and it doesn’t fit, we’ll cover return shipping and waive the restocking fee. Check my fit

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