Diode Recommendation to Prevent Trailer Battery From Backfeeding onto Vehicle Wiring

Question

Question:

Im not sure if this is the correct item for what I want to do. I want to install a battery in my cargo trailer to power the interior lights. My plan is to locate and cut the constant 12 volt from my vehicle and attach it to one side of the solenoid. Then attach the other wire to the other side of the solenoid. Them I will attach the positive from my new trailer battery to the third side of the solenoid. Does this sound correct? I dont want the trailer battery to back feed my vehicle.

asked by: John R

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Expert Reply:

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 you'd just need to install it inline with your trailer wiring matching the in and outside to your setup and you'd be good.

expert reply by: Jameson C

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Answer 1

Hey Dan! The SeeLevel monitor that includes Bluetooth is part #SE74RR on our site. You'll need 2 of the SeeLevel Sensor Tank Monitor #SE78VR as well. Are you planning on mainly using this for holding tanks, or propane as well?

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Answer 2

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.

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Answer 3

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 4

Hey Nisha, The SeeLevel Bluetooth enabled tank monitor 709-BTP7 can be purchased under part #SE74RR. If you need anything else or have any questions just let me know and I'd be happy to help.

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Answer 5

Hi Jeff, Nice choice with the 100 amp hour Go Power Lithium RV Battery #GP99QR as well as the Expansion Kit #34282182. Also, you can absolutely replace your PD9260 with the PD9360 model that is compatible with lithium batteries, and our part number…

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Answer 6

Thanks for reaching out, Jim! The Roadmaster Single Park Light Diode #RM-690 will work great for this application, and I'm glad to hear others have been successful using it! You'll want to install the diode on the wire connected to the 1…

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Answer 7

While unlikely, it is certainly possible that the trailer battery could backfeed to your vehicle's battery when hooked up under the scenario you described. To make sure this doesn't happen all you need to do is add a single diode like the…

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Answer 8

Have you tested the brake controller output on the 2025 Silverado's 7-way and confirmed that it's sending power back to the trailer when the manual override is being activated? When you say the brakes aren't activating as they should do…

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Answer 9

Something is obviously causing a voltage drop between the brake controller and the trailer connector. The usual culprit in this type of situation is a break in the wire or a corroded wire. Check the wiring under the truck. You should be able to trace…

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Answer 10

Hey Teo, we have a solution for you but we don't have any harnesses that work as both a tow bar lighting kit and a trailer wiring kit. So what you'd want is the Curt part #C96JR for the tow bar lighting and then for the trailer wiring…

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Answer 11

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.

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Answer 12

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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Diode Recommendation to Prevent Trailer Battery From Backfeeding onto Vehicle Wiring

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