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Old 05-27-2014, 11:21 PM   #1
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ACE Battery Disconnect use

Hi,

As a newbie RV owner, i'm unsure as to the proper use of the chassis/cabin battery disconnect switches. After installing the third replacement chassis battery on the RV and based on the recommendation of Thor, since the Jensen radio seems to stay on when the RV engine is off I was advised to disconnect the chassis battery when parking the RV. However, I've noticed when I do so the RV has trouble cranking on for the first time when cold. Could this be attributed to disconnecting the chassis battery? After turning it on for the first time it seems to crank back up without any issues. Any other recommendations on when to disconnect the cabin/chassis batteries is appreciated. Thank you!

(When I say the Jensen radio stays on i'm referring to the blue light that stays on around the edge of the radio).
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Old 05-27-2014, 11:39 PM   #2
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I have a disconnect switch for the 12 volt engine battery and I disconnect that battery as soon as I get home. If I forget the battery will run down in about 3 weeks.

My two six volt house batteries also have a disconnect switch but I seldom use that as I have full hookups at my house and keep the coach plugged into shore power.
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Old 05-27-2014, 11:51 PM   #3
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Thanks for your reply. Does your rv take longer to start up the first time after having the engine batteries disconnected? When I say mine does i mean it takes like 3 seconds with the keys turned to crank up. This is the case after installing a brand new engine batter with the same amount of cranking amps as the original battery.
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Old 05-28-2014, 08:55 AM   #4
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No, mine always starts quickly no matter what unless the battery is low, in which case it doesn't turn over at all, just clicks.

I would suggest turning the ignition key to the running position, not start it yet, and let it sit to the count of five and then see if it starts right away.

It sounds like it's starved for fuel and once enough is pumped to it the engine will start fine until you sit and lose the fuel back into the system.

My grand daughter's Chevy pickup with the 5.3 gm has that problem. First start in the morning it cranks about three to five seconds. If she turns the key on and waits a bit the fuel pump brings up the pressure and it starts right away.
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Old 05-28-2014, 09:27 AM   #5
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Quote:
Originally Posted by George1285 View Post
Hi,
As a newbie RV owner, i'm unsure as to the proper use of the chassis/cabin battery disconnect switches.
George
As built by SMC, my coach has a house battery disconnect switch, (aka: the "salesman" switch), but NO chassis battery disconnect switch.

I have never turned the salesman switch off, (except accidentally).
IMO battery disconnect switches are not needed, if/when all of the 12VDC accessories/appliances/items in a coach are used correctly.
I have eliminated all unnecessary parasitic/phantombattery draws.... AND I make sure that everything 12V is switched OFF, (or unplugged), when it's not being used.

BTW, the memory and small LED light of my dash radio continually draws a tiny amount of 12V from my chassis battery.
The radio itself uses 12V from the house batteries, (but only when it's turned on/operating).

Mel
'96 Safari, 132 k miles, (mine since '01)
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Old 05-31-2014, 08:56 PM   #6
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Quote:
Originally Posted by Arch Hoagland View Post
No, mine always starts quickly no matter what unless the battery is low, in which case it doesn't turn over at all, just clicks.

I would suggest turning the ignition key to the running position, not start it yet, and let it sit to the count of five and then see if it starts right away.

It sounds like it's starved for fuel and once enough is pumped to it the engine will start fine until you sit and lose the fuel back into the system.

My grand daughter's Chevy pickup with the 5.3 gm has that problem. First start in the morning it cranks about three to five seconds. If she turns the key on and waits a bit the fuel pump brings up the pressure and it starts right away.

You were absolutely right. I turned the key just a bit till the gauges turned on and it turned on right away. I only need to do this when starting the rv after battery's were disconnected. Thanks!
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