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Thread: Factory battery disconnect?
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07-21-2021, 08:15 PM #21
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07-21-2021, 08:23 PM #22
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Why should the OEM battery switch never be used? There is absolutely no reason to add a second disconnect switch. It's simply to rewire the existing switch at it's source to disconnect everything. You can also still have the emergency brake away switch wired to the battery ahead of the disconnect switch as it draws no power, this way if one forgets to turn the switch back on the brake away switch will still be doing it's job.
Bill & Colleen ~ Schwenksville, Pa
2019 Reflection 337RLS
2006 GMC Sierra 3500 8.1L V-8
Firestone Ride-Rite Air Bags
Front Stabilizer Bar
Rear Anti Sway Bar
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07-21-2021, 08:48 PM #23
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On our Fuzion we just sold, the "battery disconnect switch" didn't disconnect the battery from several parasitic drains. We found out the hard way shortly
after we brought it home. After a week, it had drained the house battery, and had to be connected to a battery charger to get it back up enough to even
work the stabilizers. Shortly after that we put an aftermarket real battery disconnect on the positive post of the battery. No more dead batteries due to
parasitic drain.
On our present 2019 Momentum 351M, the battery disconnect switch actually does disconnect the parasitic drains. Some things like the jacks still have
available power, but no draw unless you use them. I won't be putting an aftermarket battery disconnect switch on this trailer.
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07-22-2021, 06:58 AM #24
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07-22-2021, 07:30 AM #25
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07-22-2021, 08:13 AM #26
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I was simply defaulting to the simplest way to achieve full disconnect as some peeps don't like to mess with OEM stuff. Obviously one can spend the time and effort to reroute wires to/from OEM switch if they are up to it. I wish the trailer builders would all be consistent, then at least we could all be on the same page.
Jim (& Sharon)
2015 GD Momentum 385TH - SOLD
For Sale - 2015 Ford F-350 DRW 4x4 Lariat w/ AirLift bags, Titan 65 gal. OEM replacement fuel tank.
The toy:
2017 RZR XP 1000 EPS SE
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07-22-2021, 08:44 AM #27
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Interesting discussion, but very important.
Bottom line: if the "specific gravity" drops low enough, you're batteries could freeze at temperatures above 29 degrees F. So, as the battery discharges, the freezing temperature of batteries will shift higher. With a fully charged battery you're good to about -70 degrees F.
Even a moderate drain to the batteries can be fatal, over time, especially in winter. I wintered in Brownsville in Feb of this year. Got caught in the winter storm with prolonged power outage. I didn't take a generator because I was told it never freezes in Brownsville, except this time.
I had propane and continued to run my propane heat until it occurred to me the heater blower motor must me running on batteries. I checked my batteries and was down to one third charge so I turned off the propane heat and just used the kitchen stove for heat. That same night it got down to 20 degrees and the outside cells of both 12v, Interstate batteries froze and ruined both batteries. I got the batteries replaced via insurance, along with numerous other problems that developed because of the freeze.
While trying to recharge both batteries over a period of several days, I contacted Interstate engineering services and was finally able to confirm the frozen cells usually "short" internally as they freeze and are then unable to be recharged.Last edited by toolman.dustin; 07-22-2021 at 09:50 AM. Reason: spelling
Dustin and Doris
2018 2600RB
2016 Tundra: 5.7L with towing package.
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07-22-2021, 09:33 AM #28
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08-22-2021, 04:25 PM #29
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We have a 2021 GD 303RLS with 2 group 27 lead-acid Interstate batteries. Each rated at ~100 Ah. I have already killed the batteries once. Took them down to ~3-volts. Luckily they came back to life and took a full charge. Measured the parasitic draw today. AC power shut off. Factory disconnect opened. All lights in the off position (motion detection off). Refrigerator off. Using a Fluke multimeter, inline on the negative battery terminal, I measured 0.335A. WOW. Completely unacceptable. Simple math shows this will completely drain my batteries in ~24 days. A full battery disconnect switch will be installed soon. Can not risk draining the batteries again.
Ken & Tammy
Union Valley, TX
2021 GD Reflection 303RLS 5th Wheel
2019 Ram 2500 6.7L Cummins 4x4
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08-22-2021, 04:36 PM #30
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This thread got me curious so I did some checking with our 2019 Momentum 351M. With the OEM battery disconnect turned to Off, it showed
about 0.01 amp. With the OEM battery disconnect turned to On, the draw was 2.2 amps. That wouldn't take too long to drain a battery. But
the disconnect surprised me because it actually did work.Howard and Peggy
2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
His: 1999 Honda Interceptor
Hers: 2013 Spyder ST-S
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