How to charge a trailer battery with a 7 pin plug

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Dan charges the trailer battery with the Topdon Tornado 4000 and adds wiring to the trailer to make sure he never has to charge it again.
©2022 Dan's Garage NC
Episode: 0102
Vehicle: Car Trailer
Work: Charging the battery and adding wires to the trailer so he never has to again.
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Опубликовано:

18 май 2022

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Комментарии : 76

@TonyReilly-mt7uu 2 месяца назад

Very helpful, thanks.

@DansGarageNC Месяц назад

Glad it was helpful!

@bobdavis5216 Год назад

Amazon or any large RV store will have a heavy duty on/off switch so you don’t need to disconnect the battery cable to the winch every time you use it.

@DansGarageNC Год назад

That is a good idea, thanks.

@TheCanadianBubba 2 года назад

Nice work Dan 👍

@DansGarageNC 2 года назад

Thanks

@JamesJones-th9mi 7 месяцев назад

❤

@ntme9 Год назад

I've always wondered what regulates the amperage on the 7 pin 12 volt. What voltage does it charge at when the truck is running? Is it 14.4 just like the battery under the hood?

@DansGarageNC Год назад

Yes it charges directly from the alternator.

@raytonwhite4187 5 месяцев назад

No that’s not true. Any excess batteries will not be charged at 14.4 going through 14 gauge wire. You’ll be lucky to get 12.9 or 13 at the rear battery.

@ntme9 5 месяцев назад

@@raytonwhite4187 Not exactly, it's complicated, it depends on the amps going though the wire. If the battery is fully charged and there is no transfer of wattage you will see 14.4v (or same as voltage at truck battery) If the battery is low, say 11 volts resting, and you plug it in, then you will get a transfer of high wattage, thus high amps, thus voltage drop (bc of small wire), but as the SOC (state of charge) goes up on the battery, simultaneously the current draw will drop and the voltage will rise. No different than if you have two water tanks connected with a line and one is higher than the other, they will flow to each other if you open the valve and eventually even out.

@larryseibold4287 7 месяцев назад

What does the 4A charger in the first half of this video have to do with the 7 pin plug charging of the winch battery? What is the fuse rating that feeds that 7 pin connector? How does operating a winch (~300A) not blow that fuse while it is connected, even it the second battery? Did you install a breaker as you mentioned or rather a fuse (replaceable vs resettable)? What amperage did you install in the positive line?

@DansGarageNC 6 месяцев назад

That charger was just what I used to top off the battery to start with. I am not sure what fuse the truck has on the 7 pin, but I have a 3oo amp resettable breaker on the winch line. It has never blown. Thanks for the questions.

@bryanmccammon1116 Год назад

What size circuit breaker did you install. I'd like to do what you did but with a 1000 watt power inverter instead of a battery

@DansGarageNC Год назад

You need to check the max draw of your winch and whatever else will be running on the line and see what your truck fuse is to determine what size breaker you will need. A power inverter is for household 110 stuff, unless that is what your winch runs on?

@anthonyspadafora1384 Месяц назад

The 12 volt terminal on the truck side of the plug, isnt that a much smaller wire? Does that wire also have a fuse?

@DansGarageNC Месяц назад

Using a bigger wire is better than using a smaller wire. I believe it is all fused.

@rustyedges704 7 месяцев назад

For the power converter you bought how do you like it now after you're using it for a while?

@DansGarageNC 6 месяцев назад

What power convertor? The winch runs off the battery in the trailer. Everything is working great.

@shekharmoona544 Год назад

Can you charge a travel trailer battery while it's in it's cradle with a regular harbor freight car battery charger? (Microprocessor charger)

@DansGarageNC Год назад

I would set it up with a trickle charger when you are not using it to keep it topped off.

@joebieber9768 2 года назад

Did you run a ground wire from the plug to the negative post on the battery?

@DansGarageNC 2 года назад

No, the plug is grounded to the chassis of the trailer and I ran a wire from the battery to the chassis as well.

@brandonhamner3928 Год назад

Just curious on what would happen, if anything, if you spliced from the hot wire on your 7 pin trailer harness as well as a ground wire (adding battery clips and a way to quick disconnect from harness slice) to the trailer battery. Would there be enough power to operate the winch at all? Would it charge the battery any if you left it hooked up while the vehicle was running?

@DansGarageNC Год назад

That is basically what I did.

@raytonwhite4187 5 месяцев назад

That is basically what you did but you also added a battery charger. Could you have just ran a wire from your seven pin straight to your battery. And if so, would your alternator charge that back battery. Without the battery charger.

@JamesJones-th9mi 7 месяцев назад

Cuz what I was thinking of doing is tap into that pigtail running the wire to the positive and then for the negative just running in a separate wire from the battery to the fame

@DansGarageNC 7 месяцев назад

The truck and trailer are grounded through the hitch as well, so either way should work.

@Johnstonfamily2012 Год назад

Any issues with the battery back feeding lights or anything? Someone told me I needed to add a diode inline

@DansGarageNC Год назад

I haven't noticed any issues, but that is a good idea. I think I was going to but never did.

@simpleman6520 2 года назад

Hey Dan, I am looking into buying a Max Built ca hauler and I saw your video about a year ago. How is the trailer holding up? Would you recommend it?

@DansGarageNC 2 года назад

Yes, It has been great so far. I have picked up a couple cars from VA and brought them to NC. I did add a box on the tongue with a battery and a winch. I am going to put locks on the ramps also. I prefer the ramps that slide out the rear, but these are working ok. I do store them upside down so water does not pool in them. No complaints.

@Johnstonfamily2012 Год назад

Max built’s manufacturing facility is literally just down the road from my house. I just bought a 24’ steel deck from them and working on doing this same set up myself. Their trailers look pretty good so far

@JamesJones-th9mi 7 месяцев назад

Do you have to mount a negative wire as well or is it because it's already grounded and all you need is

@DansGarageNC 7 месяцев назад

There is a negative wire in the pigtail.

@heribertoperezteran8316 Год назад

Are there any risk to damage electrónics in towing vehicle( overvoltage or something)?

@DansGarageNC Год назад

I would imagine there is protection from the manufacturer on the plug.

@heribertoperezteran8316 Год назад

Can trailer battery start a truck in case of low or death battery ?

@DansGarageNC Год назад

If you don't put in an isolator, yea. But if your truck battery dies and they are tied together, the trailer one may be also. I would recommend a lithium ion battery jumper pack, very handy.

@chickenfoundation9323 Год назад

What about the ground? Does the battery ground to the trailer frame or does it need to ground to the harness?

@DansGarageNC Год назад

There is a ground in the harness, but the trailer frame should be grounded also.

@raytonwhite4187 5 месяцев назад

Another good question. But you cannot use a trailer as a ground. The trailer is used as a neutral to complete a circuit. That’s why when you install a 12 V light in your trailer. One power goes into the light and a neutral comes out, connecting to the frame, which is a neutralcompleting a circuit. If you are grounding a battery to a trailer frame, you would be very surprised checking the amperage of your trailer frame.

@gadsdenconsulting7126 2 года назад

Thanks for posting this. I may have missed it, but how are you powering a 110v charger, using a 12v power supply from your 7-way plug?

@DansGarageNC 2 года назад

The 7 pin from the truck has a 12Volt positive from the truck, that goes to the battery on the trailer through a breaker. But that is only really to keep the battery charged up. If it gets too low, I would charge it with a battery charger.

@gadsdenconsulting7126 2 года назад

@@DansGarageNC I see what you're saying about charging the battery off the 12v line in the 7-way plug, but isn't that charger a 110v charger that you plug into a wall outlet? I don't understand how 12v is powering a 110v electronic, if that makes sense? Thank you for the reply!

@damenrunnels7521 Год назад

This does not work

@DansGarageNC Год назад

@@damenrunnels7521 Do you need to make sure that the feed from your truck has 12 V positive and charges with your system. Check that first.

@damenrunnels7521 Год назад

@@DansGarageNC So I should revise... it works as a passthrough but so would just a regular wire and I just wired it that way to the 12v on the 7blade. The charger was 180 bucks I actually bought the one from your video as I was cutting the cord off of it to wire it I thought there's no way this is going to work and it doesn't it doesn't power the charger at all. Now you will get a continuous feed through it and it basically acts as a 12 volt feed through to the positive side of the battery but as I stated so does just a wire.

@greasyboykustoms 2 года назад

Now come do mine !

@DansGarageNC 2 года назад

Be right there.

@raultrevino4384 Год назад

What about your ground?

@DansGarageNC Год назад

The 7 pin has a ground, and the trailer is a ground.

@raultrevino4384 9 месяцев назад

I had the same question 😂

@danielfam27 4 месяца назад

Do you need to have a DC to DC battery charger for that?

@DansGarageNC 4 месяца назад

No, I charged the battery before I hooked it up, but now it just charges when the truck is running.

@stevewhitener290 11 месяцев назад

Need a dc to dc charger to fully charge trailer battery while driving, you are only trickle charging the battery like you have it..

@DansGarageNC 11 месяцев назад

It is getting charged the same as the regular battery. I can always put a charger on it from time to time to make sure it is fully charged if I need to. I have not had any issues with the setup.

@lolobernal8362 Год назад

This lil girl must be a star now. Def in tv somewhere maybe BGC

@DansGarageNC Год назад

She is always on stage!

@chickenfoundation9323 Год назад

Also do you know what gauge power wire is coming from the vehicle?

@DansGarageNC Год назад

I do not, you could prob find out online.

@ramonelewis8135 Год назад

So, just a Hot from the 7 pin plug to the battery? No extra ground needed?

@michaelrudd1181 Год назад

I don't have shared comment what is cuz I don't know where it come from

@DansGarageNC Год назад

Thanks for the comment.

@damenrunnels7521 Год назад

So I tried this it actually does not work. I knew better as a 110 will not be powered by 12 volt without a converter

@DansGarageNC Год назад

It does, you have to connect a wire at the truck battery and then it will power the 12volt at the trailer connector. There is no need for a 110 convertor.

@mikeandmelissa01 Год назад

it's not charging 110 by 12 volt, it's charging a 12 volt trailer battery with the 12 volt truck battery

@mikeandmelissa01 Год назад

Dan you are right it does, I was talking to the person that said it wouldn't work. I have it the same way you did on my car trailer and winch. like your channel

@ntme9 Год назад

People are getting confused about the 120v charger he unboxed at the beginning of the video. That charger has nothing to do with the 7 pin wire job he did to the trailer. Two different things.