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Old 05-22-2015, 08:17 AM   #1
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Chassis stereo drains chassis battery when used for house

Newbie here....living fulltime in RV for last two weeks....loving it!

The car stereo head unit has a switch so that I can still use it even when the chassis electrical is off (no key in ignition switched to accessory or run).

I thought that meant the stereo would be powered off the house but apparently not. Last night I lost power to my speakers while the head unit appeared fine. This morning I disconnected the chassis battery hoping to reset the ABS light and later when I reconnected the battery went to crank the engine, the battery was nearly dead so I cranked using the house batteries.

Well, the stereo then worked perfectly once the engine was on so I figured that last of sound last night was due to the voltage being too low on the chassis battery.

I'm going to work around this by putting a trickle charger on the chassis battery but I was wondering if the stereo is wired incorrectly, that it should be getting power from the house?

Thanks, Ron.
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Old 05-22-2015, 08:25 AM   #2
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I'd say so. Actually I have seen the stereo wired both ways depending on the unit. Since you have the switch you already have an easy point to identify the wires so it should not be difficult to run a wire to the house supply for one side. If you luck out you might even find the wire is already in place but connected to the wrong junction block somewhere.
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Old 05-23-2015, 02:26 AM   #3
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You might want to get an Amp-L-Start to charge the chasis battery when plugged in.
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Old 05-23-2015, 05:41 AM   #4
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Quote:
Originally Posted by Sue46 View Post
You might want to get an Amp-L-Start to charge the chasis battery when plugged in.
I agree. Add the amp-L-Start that way no matter what other drains on the chassis battery that may be there the chassis battery will always be charged.
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Old 05-23-2015, 06:50 AM   #5
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It is not wired "wrong", just a bit different. It is simply bypassing the ignition switch function. The additional charger is the ticket because you need that anyway to protect those expensive batteries.
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Old 05-25-2015, 07:19 AM   #6
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Much thanks everyone! :-)

I ordered the Trik-l-Start version for $30 as it seemed adequate for my needs.
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Old 05-26-2015, 03:37 AM   #7
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We just bought our first MH, Winnebago Vista and found out we didn't need the Amp-L-Start, seems that it came with one. At least that is what the literature says, trying to figure out how to confirm it.
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Old 05-26-2015, 08:47 AM   #8
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Sue, this is a good time to get familiar with your batteries and how to use a voltmeter if you have not done so before. Lots of videos on using a voltmeter are available.


What you need to do is simple. Measure the voltage on each bank of batteries to see if the voltage is extremely close or exactly the same while on shoreline, generator, or engine running.
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