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Open Roads Forum  >  Fifth-Wheels

 > Can you jump your 5’er with your truck?

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pyoung47

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Posted: 03/20/22 05:47pm Link  |  Quote  |  Print  |  Notify Moderator

I’ve never done it, but I carry two sets of cables for that eventuality.

Bionic Man

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Posted: 03/20/22 08:12pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Bionic Man wrote:

If you are concerned about slides and jacks with dead trailer batteries you could plug trailer umbilical cord into the truck (with truck running) and have enough power to use the jacks and pull in the slides.
I guess so, but that doesn't jibe with the comment above about how cables will get hot. Hot comes from a lot of amps. Umbilicals don't carry a lot of amps.


All I can tell you is that I've needed to do it with my trailer, and it works for me.


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valhalla360

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Posted: 03/21/22 04:34am Link  |  Quote  |  Print  |  Notify Moderator

Mondooker wrote:

My unit has two 6 volt batteries, four 6 volt batteries actually. Hopefully the solar will keep the batteries up? But great to know the truck batteries could be used if necessary.

Thanks guys


Don't try jumping if you don't understand the difference between a 6v system and 6v batteries wired to produce 12v.

But yes, you can power your RV 12v system by connecting into the truck battery:
- Leave the truck running, so you don't wind up with a dead truck battery (don't do this for long periods).
- You aren't "jumping" as that implies starting an engine...or using a big ramp to leap your truck over the top of the 5er (take a video if that's what you meant).

Google 6v batteries wired for 12v and make sure you fully understand how they are wired and where you would connect before trying it.


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schlep1967

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Posted: 03/21/22 06:24am Link  |  Quote  |  Print  |  Notify Moderator

It's funny that people think heavy gauge jumper cables are going to get hot. Look at the wires going into the landing gear motor. Not exactly heavy wiring.
I had switch problems on my landing gear. I used my jumper cables that are 20 foot of 4 gauge wire. I clamped directly to the wires coming off the motor. The landing gear motor runs much faster when using the jumper cables than it ever did using the factory wiring.


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2oldman

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Posted: 03/21/22 08:03am Link  |  Quote  |  Print  |  Notify Moderator

schlep1967 wrote:

It's funny that people think heavy gauge jumper cables are going to get hot.
Yeah, that is strange. They're designed for hundreds of amps. The clamps that connect to the batteries may get hot, over time, and transfer that heat to the cable.

* This post was edited 03/21/22 10:06am by 2oldman *

dedmiston

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Posted: 03/21/22 10:34am Link  |  Quote  |  Print  |  Notify Moderator

I've done it tons of times over the years. It's the #1 reason that I always unhitch from the truck (so I can turn the truck around to jump the gen if I need to). I don't really worry about it anymore with solar, but it's still a habit for me.

Keep in mind that you want to jump from the truck to the gen, not to your trailer batteries. If you have a large battery bank, it will take too long for the batteries to charge up enough to crank the gen. But you can connect directly to the hot side of the gen and the ground, and then it cranks right up.

It's always a shameful moment when you have to jump like this, but it happens a couple times a year in our groups (not to the same person though).


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joebedford

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Posted: 03/21/22 10:53am Link  |  Quote  |  Print  |  Notify Moderator

I've had to do it both ways: jump the trailer from the truck when the battery ran down overnight from the furnace; jump the truck from the trailer (actually I started the generator and plugged in my battery charger to the trailer).

strikeu

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Posted: 03/24/22 05:20pm Link  |  Quote  |  Print  |  Notify Moderator

I was always under the impression that you get all the power you need from the 7 pin to charge batteries or use 12V for any purpose. is that not correct?


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Veebyes

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Posted: 03/24/22 05:25pm Link  |  Quote  |  Print  |  Notify Moderator

Anyone figured out the take off ramp angle & the speed needed yet?


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pianotuna

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Posted: 03/24/22 05:56pm Link  |  Quote  |  Print  |  Notify Moderator

strikeu wrote:

I was always under the impression that you get all the power you need from the 7 pin to charge batteries or use 12V for any purpose. is that not correct?


strikeu,

It is rare that the 7 pin provides decent voltage to charge the house batteries.

One reason is length of wire and that causes voltage drop. The wire needs to be beefed up.

The best solution may be a dc to DC charger placed in the line. Placed near the house bank--but not in the same compartment.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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