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Old 08-04-2015, 11:12 PM   #1
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12v Disconnect switch

We recently purchased 2006 Tiffin allegro bus. When we took it to storage unit I flipped the 12v disconnect switch on the panel by door. Now about 4 days laterI cannot get any power to coach lights or electronic buttons. The inverter box above driver seat flashes bur does not show message. Tried flipping 12v disconnect switch up but doesn't do anything except click. Engine starts fine. Generator won't start. Any suggestions. I talked to previous owner he never used the switch.

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Old 08-04-2015, 11:37 PM   #2
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Tiffin Owners Club
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Location: Carson City, NV
Posts: 2,019
Sounds like your house batteries are dead. Did you also turn off your inverter when you flipped the 12v disconnect switch? If not, that would be the cause as the 12v disconnect does not shut down the inverter.

Bob, Sherron & Kinsey (Goldendoodle)
2017 Tiffin Phaeton 40QBH
2014 Jeep Cherokee Limited
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Old 08-04-2015, 11:54 PM   #3
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If you cannot plug it in then start the engine and let it run a few minutes. Hit the boost switch and hold it a minute or so then have somebody start the generator while the engine is idling. The engine alternator should bring up the house batteries a bit and let the genset start. If it does not it will take a lot longer idle or drive but a better idea is to plug it in for several hours minimum. If you get the generator to start give the system around 4 hours to charge. You can shut off the engine if the generator starts.

After you get the batteries charged you need to figure out what does not get turned off when you flip the switch. 4 days is pretty short to run down the house batteries. I would start by testing the batteries. Get them up to full charge, shut down and disconnect either the ground or positive lead. (I do positive but some people will complain.) Let the batteries sit for a couple of days and check the voltage. There are charts that will tell you the state of charge. Here is one:

Measuring State-of-charge - Battery University

A good battery bank will still be at or close to 100%. A bank that has aged out will be obviously lower. If the battery bank is OK I would start looking for what is running despite the switch. That is mostly visual inspection following wires that connect before the disconnect relay.
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Old 08-05-2015, 12:05 AM   #4
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Georgie Boy Owners Club
Join Date: Nov 2014
Location: Roseville, CA
Posts: 147
Agree with Bob on house batteries dead, due to Inverter drain on 12v. Genny needs 12v to start & keep running.

I would suggest running your coach engine, as much as 5 minutes or more to get some juice into your house batteries; hold the disconnect switch for about 60 seconds and then, without releasing the switch, start the genny. Let both run for another 5 minutes before turning off the coach engine. Let genny run to recharge the house batteries, thru the Converter.
Larry & Sue
2005 Georgie Boy Pursuit 3180DS, 31'5" Class A, 18K GVWR, 208", F53/V10, CHF, TST 507, FMCA, GoodSam
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