How Does the Charge Line from a Motorhome to Towed Vehicle Work Together

Question

Question:

How does the car and Motorhome Charging Kit work together. I have a hot wire on the Motorhome in the 1:00 Position 7 RV Blade socket and the towed car Hot wire in the center post socket 6 Pole Round I checked both socket with a Tester and they are hot.

asked by: Richard B

0

Expert Reply:

The Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75 uses a 12 gauge wire and circuit breaker to route to the positive battery post in your motorhome and the number 4 pin in the included 7-way photo.

The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 uses a 14 gauge wire and circuit breaker to route to the positive battery post in your towed vehicle and the number 2 pin in the included 6-way photo.

You would then need a 7-Wire to 6-Wire Cord like the # RM-1676-7 to connect the 7-way from the motorhome and 6-way from the towed vehicle.

expert reply by: Scott S

0

RM-156-25 Towed Vehicle 6-way Diagram
(click to enlarge)

RM-156-75 Motorhome Charge Line 7-way Diagram
(click to enlarge)

Wyatt R.

11/21/2024

I"m using the RM charge line kit. Hooked it up last night after getting my roadmaster tow bar. I did a voltage test on the 6 way plug and the charge line is HOT. Shouldn't it have a one-way diode or something to prevent the towed vehicle from sending a charge back to RV battery? I've read lots of posts online about charge line and only a few people have installed a one directional something. Some of the more expensive kits seem to have something like that. A few have commented that the towed vehicle can charge the RV battery if the RV battery is low. Thoughts? If i want to make it one-way what part do i need to install between the RV side of the fuse and the 6-way connector? Taillight hook ups use diodes which says it prevents the signal going back to the RV. thanks, Wyatt

Kevin C.

11/21/2024

@WyattR You can install a diode # RM-690 on the charge line wire on the motorhome side behind the 7-way to prevent back feeding to the RV. The "IN" for the diode would face towards the front of the motorhome and the "OUT" would run to the 7-way. If you wanted to do this on the car side you'd still just want the "IN" coming from the motorhome side and the "OUT" running to the vehicle battery. The line as is is connected a battery so it will be hot unless the battery was dead or you had some other kind of switch inline to cut the power. Most people just leave it as is with just the included circuit breaker to protect from overcurrent but it's not going to hurt you to add a bit more protection with the diode.

Answer 1

Hey Greg! None of the kits specifically come with a diode to stop backfeeding. All you need to do is get a charge line kit like #RM-156-25 and then add in a simple diode #RM-690 on that circuit to prevent this issue. What are you setting up to flat…

view full answer...

Answer 2

Thanks for your question, Peter! I do have one question before I can point you to the correct kit. What is the year, make, and model of your RV? The reason I ask is that if your RV already has an air fitting at the rear bumper, there’s a chance it…

view full answer...

Answer 3

Thanks for your question, James. Both the etrailer #e98948 and Demco #DM9519336 base plates will have a very similar, low-profile look once they’re installed, so neither one really stands out more than the other. They’re both custom-fit for your…

view full answer...

Answer 4

Hey Tom! Since you already have your tow bar, the base plate #BX1139, safety cables #BX88197, and brake system #DM26VR cover the majority of what remains. You will also need tow bar wiring, and more than likely a high-low adapter to complete your…

view full answer...

Answer 5

Here is the Roadmaster Direct-Connect Base Plate Kit #1444-3 which Roadmaster said to use for your 2017 Jeep Wrangler Unlimited Rubicon. This comes with the arms for a Roadmaster Tow Bar #RM-676. If you are using a Blue Ox Tow Bar #BX4370 you will…

view full answer...

Answer 6

For your 2008 Honda CR-V, you will want to start with the Blue Ox Base Plate Kit - Removable Arms #BX2246 which will be directly compatible with your tow bar. The tow bar you are describing is likely the old alpha or avail model, either of which will…

view full answer...

Answer 7

Hi Robert, Diodes like the Roadmaster Single Park Light Diode #RM-690 you were looking at simply get spliced inline with whichever light function you're wanting to prevent feedback on using the included spade terminal connectors. You'll want…

view full answer...

Answer 8

Yes, you will want to use a single function diode, like part #RM-690. You will need to wire it in between the breakaway battery and the trailer battery to stop the backfeeding from the battery to the breakaway system.

view full answer...

Answer 9

The Blue Ox Patriot #BLU37TR has a 2 amp max draw on your 12v power. It keeps the internal battery charged so you have function if the main battery fails. For your vehicle battery to fail, there must be another draw on your battery. My recommendation…

view full answer...

Answer 10

Hello Garry, thanks for reaching out. The plug your are referring to on the Curt #C96JR is actually an accessory port for plugging in a 4-flat trailer harness. The weird part is, Curt stopped offering the 4-flat accessory plug while leaving the…

view full answer...

Answer 11

For your 2018 Jeep JL Wrangler, I recommend the Roadmaster EZ5 Base Plate Kit #RM-521453-5. This base plate kit is confirmed to fit your Jeep with the factory bumper and will work perfectly with your existing Falcon 2 Tow Bar. When installing the…

view full answer...

Answer 12

I would certainly recommend the 1/2-inch wire loom #459075-1. It will hold two jacketed 2 wire 10-gauge wire and three jacketed 2 wire 12-gauge wire. See pictures to the right. In addition, I was able to fit comfortably eleven individual 16-gauge…

view full answer...

How Does the Charge Line from a Motorhome to Towed Vehicle Work Together

Products Featured in This Question

Product Page this Question was Asked From

Featured Help Information

Instructions

Miscellaneous Media

Continue Researching