Wiring Diagram For Charging Trailer Battery
A diode wouldnt do that they are just used to keep the trailer wiring from backfeeding to the tow vehicle wiring as in if the trailer wiring shorts out it wont damage the vehicle. If you have already added the fuse and the trailer charge circuit is not activated in the 2019 ford f 350 super duty with factory integrated brake controller then you want to make sure the trailer is connected and you press the brake according to a ford service bulletin on their factory integrated brake control with trailer module 12v charging system.
Split Charge Trailer Battery Isolator Circuit Guide
The proper way to charge an additional battery pack off an alternator would be to use a battery isolator such as our quick power 120 amp battery isolator bi303303.
Wiring diagram for charging trailer battery. I would recommend using 10 gauge wire part 10 1 1 and connecting to the black wire on the trailer 7 way or the pin in the 11 oclock position when looking at the front of the connector to the. I have included links to the two nuts used to secure the wires to the studs. For the best protection of your vehicles battery and wiring we recommend installing a 40 amp circuit breaker pk54540 inline on the charging wire going from your vehicle battery back to the trailer connector on your vehicleif your vehicle has a factory 7 way connector the charge line will be protected by a fuse in the power distribution box under the hood so adding a circuit breaker would.
Dropping below a 50 charge will shorten the lifespan of the battery. If you upgrade the 12v acc. To maintain power to the battery you would need to run a wire from the positive terminal on the trailer battery to the power wire on the 7 way.
Pin on the 7 pin to 10g wire with a 40 amp fuse i believe the stock trailer wiring harness is 12g and only 20 i would probably be easier to run a seperate wire with a plug on the end that way you wouldnt have to mess with the factory harness and worry about loosing your lightstrailer brakes or something. You can use standard 10 gauge electrical wire but thicker wire will carry more current and give a better charge. Use two different colors of wire such as red and black so you can easily identify positive and negative.
You will need to run a 10 gauge power wire like the 10 1 1 from the 4 terminal 12 volt on the 7 way trailer connector on the trailer to the positive terminal on the trailer battery. Once you have located the wire you will need additional hardware to secure the wires to the studs. I have included an article and a video that shows the location of the brake control wire and the battery charge wire on your vehicle.
As far as charging the batteries i would not suggest hooking them up to your car battery for charging as you could damage your car battery by the alternator overcharging it. If you dont have a built in indicator a battery monitoring system can provide the status of your charge. Battery health a note on battery health before we beginalways monitor your trailer batterys charge to ensure it doesnt drop below 50.
This will allow you to maintain a charge on your trailer battery it will not charge the battery from a discharged state. Youll either need a smart charger make sure it cuts off the battery or a battery isolation solenoid tr118665. A half charged 12v battery will put out somewhere between 122 to 126 volts.
Run two wires from the trailer end of the seven pin connector to the trailer battery.
Split Charge Trailer Battery Isolator Circuit Guide
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