Why Is There A Charge Line Voltage Drop When Connecting To The Towed Vehicle Battery
Updated 06/23/2023 | Published 06/11/2023
Question:
I recnetly bought and installed a roadmaster charge line kit on my Jayco 26y. I do not think it is charging my toad. I have 14 vdc on the wire coming from the 6 pin connector center pin when the RV is running and it is not connected to the toads battery. But when I connect it to the toads battery it s to the toads battery value 12.3vdc. Stumped. All wiring has been checked and the RVs 7 pin connector measures 14V on the AUX when the RV is running. There is 14V on the wire up to the battery but when I connect it to the battery it s to the battery voltage.
asked by: Don J
Expert Reply:
A possible reason that you're seeing the voltage drop from 14v to 12v is being the alternator is charging the motorhome battery and it's now being placed under a higher load having to charge the towed vehicle battery. The best way to check that your vehicle's battery is actually being charged by the Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 would be to hook everything up but remove the connection to the towed battery and test the voltage on the wire to see that voltage is flowing in from the motorhome.
Product Page this Question was Asked From
Roadmaster Battery Charge Line Kit for Towed Vehicles
- Accessories and Parts
- Flat Tow Wiring Harness
- Battery Charge Line Kit
- Roadmaster
more information >
Featured Help Information
Instructions
Continue Researching
- Shop: RV Mattress
- Search Results: trim
- Search Results: watchdog
- Video: Review of MCD Innovations RV Window Parts - RV Shade Repair Kit - MC94SR
- Shop: Portable Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp
- Shop: Power Watchdog Surge Protector with Bluetooth - Portable - 30 Amp
- Video: Checking Out the Replacement Roadmaster Coiled Breakaway Cable for Flat Tow Brake Systems
- Q&A: Installation Instructions for Roadmaster Battery Charge Line Kit
- Q&A: Full 12 Volts Not Reaching Roadmaster Battery Charge Line Kit for Towed Vehicle
- Q&A: Troubleshooting The Battery In a Flat Towed Vehicle Dying with a Charge Line Installed
- Q&A: Troubleshooting Battery Drain With A Roadmaster Invisibrake When Idle
- Search Results: water pressure gauge rv water pressure regulator
- Shop: MCD Innovations RV Shade Repair Kit - Small Spring Kit - 28mm
- Shop: MCD Innovations RV Shade Repair Kit - Medium Spring Kit - 28mm
- Shop: Replacement Roadmaster Coiled Breakaway Cable for Flat Tow Brake Systems
- Shop: SnapPad XTRA Jack Pads for Lippert Leveling Systems w/ 9" Round Jack Feet - Qty 4
- Shop: Roadmaster Battery Charge Line Kit for Towed Vehicles
- Video: Valterra Adjustable Water Regulator for RVs Spec Review
- Shop: Trailer Hitch
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams
- Shop: Trailer Wiring
- Q&A: Best Suspension Upgrade for 33" Tandem Axles: Road Armor vs Dexter EZ Flex for Ember 22ETS
- Search Results: trailer tires and wheels
- Article: How to Measure for Trailer Hitch Drop
- Search Results: trailer wiring
- Shop: Suspension Enhancement
- Article: 30-Amp and 50-Amp RV Service: What's the Difference?
- Search Results: trailer jack
on Accessories and Parts
