Can you jump your 5’er with your truck?

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.

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.

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

I've checked the amp draw on my Momentum when running the slides in/out, and it pulls 65 amps. Yeah, I think those jumper cables will get pretty warm. :) If those trailer batteries are way down, you will be pulling some pretty high amps.

If the trailer battery bank is low, for whatever reason, plug into the truck as per usual & run the truck as fast idle for a bit before trying heavy draw things like slides.

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.

I DID NOT KNOW THAT!

Why are you wanting to “jump” the trailer? 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.

Mondooker wrote:
My unit has two 6 volt batteries, four 6 volt batteries actually.

Together it is one big 12v battery. Connect on the right terminals and all will work fine.

2oldman wrote:

jdc1 wrote:
To maybe pull in a slide or raise the jacks? Why not? But, your cables are going to get REAL hot.

Hot? Running jacks?

That's 25 foot of cable that'll be needed. You should see how hot my in bed transfer pump cables would get....and they were only 12' long.


6X2=12volt