Trailer Life Magazine Open Roads Forum: Fifth-Wheels: 12V Power
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tersct

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Posted: 08/18/19 11:06am Link  |  Quote  |  Print  |  Notify Moderator

My 5th wheel does not power off of my vehicle when connected to it. A couple of times after it has set for a period of time, with no power connected to it, the 12V battery needs an assist to get the front jacks to raise for movement. This usually happens when I leave it at a dealership for repair work. When this happens they have had to use a battery pack (?) to raise the jacks. Who can tell me what type of pack they are using? Is it just a rechargeable battery pack or is it something else? Thanks.

2oldman

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Posted: 08/18/19 11:30am Link  |  Quote  |  Print  |  Notify Moderator

I don't know.. another battery? Sounds like you should be disconnecting your battery when sitting.

enblethen

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Posted: 08/18/19 11:31am Link  |  Quote  |  Print  |  Notify Moderator

It could be something like this Battery pack
Some shops use a large battery fixed to a hand truck.
I carry one of the battery packs in each of my vehicles for winter use and on the road for emergencies. Not only for me, but for others that have difficulties. Harbor Freight quite often have them for less then $40.


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Lwiddis

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Posted: 08/18/19 11:57am Link  |  Quote  |  Print  |  Notify Moderator

Solar! Repeated deep discharges from use or “just sitting” without full daily recharging are battery murder.


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time2roll

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Posted: 08/18/19 12:00pm Link  |  Quote  |  Print  |  Notify Moderator

How do you know the truck does not charge the 12v trailer battery? Get that fixed while at the dealer.

Detectors and some electronics will run your battery down when not connected to a power source. This is normal and common. You need to disconnect a battery terminal or install a switch to prevent this from happening. Typical for a dealer to let the battery go dead and sell you a new battery sooner than later. Overly discharging a battery as you describe will permanently reduce capacity and shorten the battery life.

Dealer may use a jump box direct on the battery or just a common shop battery wheeled around with jump cables just to temporarily operate the 12v systems for the fix or get you off the lot.

The 12 Volt Side of Life


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Terryallan

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Posted: 08/18/19 01:04pm Link  |  Quote  |  Print  |  Notify Moderator

tersct wrote:

My 5th wheel does not power off of my vehicle when connected to it. A couple of times after it has set for a period of time, with no power connected to it, the 12V battery needs an assist to get the front jacks to raise for movement. This usually happens when I leave it at a dealership for repair work. When this happens they have had to use a battery pack (?) to raise the jacks. Who can tell me what type of pack they are using? Is it just a rechargeable battery pack or is it something else? Thanks.


What vehicle do toy tow with. "Most" need a relay installed to charge the trailer. and then will only charge the trailer when the ignition switch is on / motor running.


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stufarmer

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Posted: 08/18/19 03:36pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like a perfect reason to consider a Solar Panel or two ..

cavie

Port Charlotte Fl/ Hindsdale MA

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Posted: 08/18/19 04:07pm Link  |  Quote  |  Print  |  Notify Moderator

1st have the battery load tested.


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salem

Central Valley, Ca

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Posted: 08/18/19 04:17pm Link  |  Quote  |  Print  |  Notify Moderator

You didn't say what type of tow vehicle, or if you did I missed it. On some trucks, such as my Chevy, the company installs a dummy fuse in the fuse box. The big fuse box under the hood up by the firewall. You have to take out that fuse and install the one that comes with it. Not sure why they do this, but that's the way it was on my '05. Worth taking a look at.

PNW_Steve

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Posted: 08/19/19 09:31am Link  |  Quote  |  Print  |  Notify Moderator

Now I am curious....

I am aware of the designation of one of the pins on the 7 pin connector is 12v supply.

I assumed that it was not used as none of the truck/trailer combos that I have owned have charged the trailer from the truck charging system.

How common is it to have that feature from the factory?


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