Battery cutoff switch

Tennessee_Nomad wrote:
Thanks... Yes I always engage the switch when towing. My round about reason for asking the question was... I blew my "trailer battery charge" fuse in the truck and I'm trying to deduce that I have everything back the way it's supposed to be. I replaced a fuse that I believe to be, the correct one.

Use a meter to see if that prong of your 7 pin is live or not. Even a test light will do the job.

dvitale300 wrote:
Shouldn't you also unplug the hookup to your truck when you are dry camping - in order to NOT drain the truck battery?

Depends on whether the battery charge wire is an "Ignition switched" circuit, ie it is only connected when the ignition is on.
I know that this is the way Fords work,
don't know about Ram
but GMs do not disconnect the trailer battery with the engine off.

Another data point:

The "Battery Disconnect" on my trailer, only disconnects the battery from the WFCO 12V distribution centre/charger.

With the WFCO disconnected by this switch, IIRC, I can operate the Slide, Stab jacks, Awning directly from the batteries. They can be operated manually or by a remote, so the electronic remote control receiver must also bypass the Battery Disconnect.

I can also operate the Brakes (via their emergency disconnect), and the factory mini solar panel is directly connected to the battery (as are my Solar additions).

And to the O.P., I'm quite sure the charge line from the TV is directly connected to batteries and not through the Battery Disconnect.

When Equalizing the batteries via my Solar controller, I (should) remove the main, non-solar battery cable (and not rely on the Disconnect) to protect the remote control receiver. As not sure how well it handles the 15.9VDC.

These trailers are getting too complicated ...

One way to narrow down the answer is to check if the switch is on the negative side of the battery. If it is, then NOTHING will get into or out of the battery.

Not to steal this thread, but it is kind of related:

I recently installed a battery cutoff switch on my TT. Put it on the positive cable because it was more convenient. Recently plugged TT in to my home outlet and my progressive surge protector showed a 1 amp draw with the disconnect switch off. How is that possible?

Because the converter is providing 12V power to all of your 12V appliances regardless of the battery swich being open.

AH64ID wrote:
Because the converter is providing 12V power to all of your 12V appliances regardless of the battery swich being open.

You may also have other 120V appliances drawing some power—the microwave oven clock, the TV (even when off), DVD player, etc. Even a GFCI draws a minute amount of power.