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Old 01-18-2018, 12:42 PM   #1
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2018 25' Flying Cloud
Portland , Oregon
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What drains the battery on a FC25 when itís off?

Iíd like to rewire my 2018 FC25 so that when you turn off the trailer at the master switch the thing really IS completely off for long term storage with no external load on the battery. I know I need to rewire the LP gas detector, are there any others devices? Iím never going to use the trailer with the power turned off and always shut of the LP tanks when the trailer is in storage.

Iíll be using a portable batteryminder 10 watt solar panel to keep the battery charged.
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Old 01-18-2018, 12:50 PM   #2
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The typical loads are the propane detector, and on some models the sub-woofer is always connected to power.

You could trace down the wiring to those items and see if their fuse and associated wire can be moved to the 'load' side of the battery disconnect relay instead of the battery side.

Be sure you don't rewire the fuses and wires going to the use/store switch...that would be an interesting troubleshooting exercise. (grin)
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Old 01-18-2018, 01:31 PM   #3
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What drains the battery on a FC25 when itís off?

Donít forget the antenna booster
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Old 01-18-2018, 02:04 PM   #4
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Subwoofer

It's hard to believe, but it is true. On my 2013 Intl, the subwoofer is wired straight to the battery through the street side electrical port to the A frame. Good enough for AS, I guess. Not good enough for me.

-a
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Old 01-18-2018, 02:13 PM   #5
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On ours, I disconnected the 1000w inverter. It was wired directly to the battery
and was drawing about 1/2 amp even if turned off. Also put a switch on the propane detector and removed the fuse from the sub woofer.
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Old 01-18-2018, 02:35 PM   #6
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I simply installed an on/off switch on the outside of the battery box. Now when I park it after a trip, I just turn it off and everything is disconnected.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I had to rewire things so that the positive connections to the batteries and power jack go through the switch.
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Old 01-18-2018, 04:27 PM   #7
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Quote:
Originally Posted by bwpaint View Post
On ours, I disconnected the 1000w inverter. It was wired directly to the battery
and was drawing about 1/2 amp even if turned off. Also put a switch on the propane detector and removed the fuse from the sub woofer.
Agree, the inverter is one of the big current draws even when off!
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Old 01-18-2018, 04:29 PM   #8
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Originally Posted by SeaLevel View Post
I simply installed an on/off switch on the outside of the battery box. Now when I park it after a trip, I just turn it off and everything is disconnected.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I had to rewire things so that the positive connections to the batteries and power jack go through the switch.
A couple of questions for you:

1) Did you mount the switch in the wall of the battery box?

2) Were the cables long enough to do this?

3) So you did the red cables? They are shorter than the black cables on mine.

4) Why did you decide to wire the power jack into the switch?

Thanks!
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Old 01-18-2018, 06:13 PM   #9
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Originally Posted by billrector View Post
A couple of questions for you:

1) Did you mount the switch in the wall of the battery box?

2) Were the cables long enough to do this?

3) So you did the red cables? They are shorter than the black cables on mine.

4) Why did you decide to wire the power jack into the switch?

Thanks!
1) Yes. See the picture below.
2) Yes. One of them just barely.
3) Yes. See the picture below.
4) I replaced my power jack with one that is wired (both positive and negative) directly to the batteries, and I didn't want it to be connected when the trailer is parked for storage.

I've been very happy with how this works. I used to lose some charge in-between trips, but now it's negligible, even after about a month, which is the longest we've gone between trips so far. They might go from 12.86 to 12.84 as measured with my Fluke meter.
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Old 01-18-2018, 08:39 PM   #10
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What drains the battery on a FC25 when itís off?

Iíve mounted the switch both ways - inside the box and outside. Inside is my preference if there is room.

Iíve also used single and dual pole switches. Use a blue sea switch - they are about $30 bucks or so.

This question gets asked once a week so I went ahead and drew up wiring diagrams for fellow airstreamers - see attached.

Enjoy.
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Old 01-18-2018, 10:16 PM   #11
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What drains the battery on a FC25 when itís off?

What everyone said above PLUS: I believe that the USB ports have a parasitic draw as well.

Also, I listened to the fellas above and installed the cutoff per their instructions and the parasitic draw problems became completely irrelevant and are saving batteries.
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Old 01-18-2018, 11:56 PM   #12
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Disconnect the battery completely it will really be off and costs alot less then rewiring a brand new trailer
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Old 01-19-2018, 01:21 AM   #13
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Thanks everyone! This is truly crazy on Airstream’s part to have a master switch that clearly isn’t. It really could give people a false sense of security. I’m an electrical engineer and thus can’t seem to leave things alone. I plan on doing a lot of electrical work adding solar, Lithium, and a hybrid inverter so I’ll add a Blue Sea master switch then. For now I’ll just put one of these in the battery compartment. Not elegant but it solves my immediate problem. I’ll ignore the AS master switch except maybe as just a handy way turn turn off stuff when leaving for the day.
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Old 01-19-2018, 06:36 AM   #14
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Quote:
Originally Posted by daleyocum View Post
Thanks everyone! This is truly crazy on Airstreamís part to have a master switch that clearly isnít. It really could give people a false sense of security. Iím an electrical engineer and thus canít seem to leave things alone. I plan on doing a lot of electrical work adding solar, Lithium, and a hybrid inverter so Iíll add a Blue Sea master switch then. For now Iíll just put one of these in the battery compartment. Not elegant but it solves my immediate problem. Iíll ignore the AS master switch except maybe as just a handy way turn turn off stuff when leaving for the day.
Just use a simple knife switch on the negative terminal of the battery set, and connect all the negative wires to it. Then simply lift the knife switch when not in use. Simple to use, nothing to twist, turn, or get lost, no extra stuff to drill, screw, or mount.
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