Diode for Preventing Trailer 12 Volt Accessory Circuit From Backfeeding

Question

Question:

Wanting to add a battery in my cargo trailer, I want to draw off the charge 12v wire, but will I need to put any type of diode so not to back feed power to the vehicle is still plugged in? Thank you

asked by: Ron

1

Helpful Expert Reply:

If you wanted to prevent the 12 volt trailer wiring circuit from backfeeding when connected to your trailer's battery you'd have to use a diode like the part # RM-690. This will only allow the current to flow in one direction.

expert reply by: Jameson C

1

Answer 1

If all you want is to prevent the 12 volt power supply of your trailer battery wiring from backfeeding onto your vehicle wiring or vice versa what you need is a one-way diode like part #RM-690. This only allows current to flow in one direction so…

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Answer 2

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 3

The only differences between the two hubs you mentioned #8-201-9UC3-EZ and #8-201-5UC3-EZ are that the 8-201-5UC3-EZ is not pre-greased and the other is and they have different bearing between the two. But the bearings both have the same inner…

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Answer 4

For your Coachmen Camper you are going to want the Dexter Electric Trailer Brake Kit #23-105-106 for an exact replacement to both the left and right brake assemblies that you currently have. Our part number dropped the -00 at the end. The Dexter…

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Answer 5

I believe you almost solved the problem when you swapped the wiring, but in reality you needed to use 10 gauge wire like part #10-1-1 (sold by the foot). You are experiencing a voltage drop due to the long distance of wire that's not thick…

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Answer 6

For the brake circuit of your trailer you will want to run 10 gauge wire like our part #10-1-1 which is sold by the foot and is standard copper primary wire. We use it all the time here on trailers and it works great. For bonded 14 gauge wire that…

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Answer 7

Hey Kevin, thanks for reaching out! At this point in time SmartPlug hasn't made a special connection for the Starlink internet system, but they do have their SmartPlug RV/Marine Data Port Inlet #SM36MJ. From my understanding Starlink has an…

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Answer 8

The "Trailer Disconnected" error message on the dash with a factory brake controller is usually related to an issue with the blue brake output wire that runs from the brake controller to the 7-Way connector. The fact that the issue remains…

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Answer 9

Wiring in the parking light diode #RM-690 is easy. All you have to do is locate the wire leading to the parking light bulb. Cut the wire and insert the diode in-line with the wiring. The IN side will be the part of the wire that leads to the front of…

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Answer 10

A diode is designed to stop the reverse flow of current in an electrical circuit. Therefore yes, a diode will prevent backfeed to your vehicle from the trailer's battery. The part you referenced part #RM-790 has a dual in, single out function…

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Answer 11

Hi Randy, Are you just trying to charge the trailer batteries from the tow vehicle's 7-way? If so you're using the 12v aux pin on the 7-way and could place the diode on the trailer side just before the junction box to prevent any current from…

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Answer 12

The diode #RM-690 can handle up to 120 volts at 24 amps so it should work just fine for your needs provided nothing else exceeds 120 volts at 24 amps. Regarding your picture, most battery chargers or batteries on vehicles say not to ground the…

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Diode for Preventing Trailer 12 Volt Accessory Circuit From Backfeeding

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