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Old 04-20-2015, 07:33 PM   #1
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Battery disconnect

Hi All,
Just got home from first five day trip in our 2015 MB39. Had a great time, few minor problems, but got them worked out, went smoother than I expected. Question, read in past posts about a secondary switch needed to fully cut power so as not to drain battery's can anyone refresh my memory, I do not want to have to go through the trouble of pulling terminals off batteries. Have cut the main power switch, but I know there are still carbon monoxide, and other small items sucking power. HELP PLEASE.
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Old 04-21-2015, 09:03 AM   #2
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Yes... I own the same trailer. CO/Propane monitor is alive all of the time, your antenna booster located behind and on the left side of the bedroom TV will pull power if left on. Everything else that Ive found is controlled by switches. If you would like to cut all power from one source which would be the master switch. The switch will need to be set up to break all of the ground circuits that are coming from your battery supplies. Whether you have 1 or 2 batteries you'll need to make sure all grounds are localized to the batts. If not you can set it up that way or just pull both neg and positive cables to be 100% sure but that's a pain, then why have a master switch.
I'm actually going to make sure ours is set up to kill all power. Ill post again if I find out anymore info or surprises. I hope this helps you out.
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Old 04-21-2015, 11:11 PM   #3
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The switch only disconnects one battery according to the dealer. I'm having a second disconnect installed. Dumb design.
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Old 04-22-2015, 06:43 AM   #4
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Thanks guys, trying to also get a wiring schematic of unit, will try Redwood directly, as can't find anywhere else. If I am successful with disconnect will post also.
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Old 04-22-2015, 07:49 PM   #5
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Not that this is of any help to your question but I always had issues with my last RV and installed a disconnect on the chassis battery which worked but then some issues with the coach batteries so then I just gave up and ran a underground 50amp service next to my RV parking spot and it just stays powered up all the time.

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Old 04-22-2015, 11:20 PM   #6
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I can't sit here and tell you how to do it because my trailer isn't here. That said, I looked over the battery wiring while in Florida this winter. From what I see you do not need a second switch at all. IIRC you move one positive cable to a different position and then use a jumper between sides. There is likely enough excess wire on the cable you move to make the jumper. All that's needed are terminals and a crimping tool. The oem switch is rated high enough to carry all the load.

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Old 04-23-2015, 06:33 AM   #7
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I re-wired my Redwood to give a complete disconnect using the schematic that's available on the other forum, it required some shuffling of wires on the circuit breaker block and a bit of crimping.

Someone also suggested putting a disconnect switch on the other side (negative side) you could either move the existing switch over or put in a second switch, this solution my be easier than the re-wire that I did.
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Old 04-26-2015, 06:25 AM   #8
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Battery disconnect 39MB

Redwood has a Red Power cable from batteries going to a disconnect switch on right side wall, they also have another Red Power cable from other battery going to a breaker on the back wall that then goes up into RV.
I disconnected at input side of that breaker, purchased a second disconnect switch, attached Red cable from breaker to input side of new disconnect switch, then made another Red cable that went from output side of disconnect to input side of breaker. Installed the new disconnect directly above existing one.
That killed all power coming off the batteries.
Thanks for all input, it was very helpful.
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Old 04-26-2015, 05:36 PM   #9
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When I redid mine, I used a marine 2 battery switch. That way I can isolate either battery or shut everything down. The red positive cables from both batteries come into the switch and the red cables that were hooked to the batteries and the old switch are on the output terminal. A marine switch is made to handle the cranking amps of starting engines. The amperage it sees in this setup is a small percentage of what it is rated for.

My coach is in a storage lot with no power. A lot of times if I am just there to check something or need to run one slide out, I'll only turn on 1 battery so that the other one is still relatively fresh.
Vaughan & Tracy 2013 RW 36RL, 2013 F350 DRW CC, 2016 Focus. MorRyde IS, MorRyde pinbox, disc brakes, Comfort Ride Hitch. "Life is to be embraced, Grab it with both arms ! "
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Old 04-27-2015, 06:39 AM   #10
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Battery disconnect 39mb

Thanks Piper Guy, I to used a marine disconnect power switch rated for 300 amps, however did not use double battery disconnect, I like your idea, wished I had thought of that. Have a great day everyone, gotta go earn some bacon money, hope to see you out there soon.
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Old 04-27-2015, 08:50 PM   #11
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I couldn't find the schematic on the other forum. Would someone please PM me the location?
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