Can 12V Feed from Vehicle 7-Way Overcharge Trailer Battery

Question

Question:

If I hook up the 12 v aux power supply from the 7 pin directly to the trailer battery and then ground the battery to the trailer frame, do I need a product in between the aux power and the trailer battery to make sure the trailer battery doesnt overcharge on a longer trip?

asked by: Greg

0

Expert Reply:

You don't need to install any other parts in line with your 12V trailer battery line. Because the current being sent through the 7 pin power wire is so low, it acts more like a trickle charge to simply keep your battery topped off. It is not powerful enough to actually provide a full charge to your trailer battery, so it couldn't overcharge it even during a long trip.

The Breakaway Kit Battery Charger # 20011 is used to prevent overcharging the smaller battery in a breakaway kit, like the Hopkins # HM20001.

To actually charge a depleted trailer battery, you'll need something like the NOCO Genius Battery Charger and Maintainer # 329-GENIUS10, which draws power from a wall outlet to quickly charge and maintain your trailer battery and has built in technology to prevent overcharging.

If you don't have access to shore power, you can instead use a solar powered battery charger, like # PTW2997.

expert reply by: Carla M

0

Answer 1

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…

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Answer 2

In order for your truck battery to be able to charge your trailer battery it will have to have a connection to it that is going to have voltage like you tested. What you have is normal and the only possible downside would be if your trailer battery…

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Answer 3

To wire your vehicle battery 12V to charge a trailer battery, I recommend using a 40 amp In-Line Circuit Breaker - Perpendicular Mount Bracket #9510 along with #10-1-1 to wire your trailer connection. In order not to drain your vehicle battery, I…

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Answer 4

Battery chargers do get hot, especially if plugged in for long periods of time. If it is so hot that you can't even touch it then that would be a problem, a short somewhere either with the wiring or internal on the charger. On the wiring make…

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Answer 5

The Curt Front Mount Trailer Hitch Receiver #C31069 provides the most ground clearance out of the three available for your 2017 Chevy Silverado 1500. To give you a better idea of how low each hitch would sit once bolted to your frame I have attached…

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Answer 6

No need to worry. The 7-way connection on your RV does in fact draw power from your vehicle's 12V battery. However, the amount that is shared from your vehicle's battery is only enough to keep the RV's battery level. In other words, it…

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Answer 7

The Blue Ox Patriot Portable Braking System #BLU37TR will charge off of a 12v power source in your toad vehicle. I recommend installing the BrakeBuddy Towed Vehicle Battery Charge Kit #BB54FR to keep your vehicle's battery from draining when…

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Answer 8

The auxiliary 12-volt wire that runs from the 7-way connection to 7-way trailer plug will supply 12-volt power from the vehicle to the trailer. The 12 -volt power will allow interior or exterior lights to run that are not wired in to the…

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Answer 9

I've never heard of an actual third brake light connector on a camper shell to plug in on a truck and we don't carry any parts to do that. The light generally needs to be hardwired into the truck's brake light circuit. The issue with this…

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Answer 10

If your current springs have 5 leaves then going to a 7 leaf spring will increase the height of the trailer a little and make the trailer more susceptible to sway. Regarding capacity if you go with springs rated higher than what is required it will…

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Answer 11

From what I could find it looks like your 122R (red) and 122Y (amber) lights measure 3.75" x 1.70" x .81". We don't have any replacement lense directly for the GLO-BRITE lights but we do have some similar lights that you could use…

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Answer 12

If you are needing the hub and drum assembly then you will want to go with the Dexter Trailer Hub and Drum Assembly #8-201-5UC3-EZ but if you are just looking for an idler hub then you will want part #8-213-5UC1 instead. These come with the correct…

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Can 12V Feed from Vehicle 7-Way Overcharge Trailer Battery

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