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Old 12-24-2013, 12:35 PM   #1
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Is my voltage too low for my back up monitor?

Hello RV community,

I just purchased a 2000 national surf side. My back up camera monitor works intermittently. I measured the voltage supplied to it by the coach and it was 10.6 volts. When I hooked the monitor directly to a 12 volt power source it worked just fine.

My voltage gauge on the dash indicates that the alternator is supplying 12+ volts and everything else works fine in the coach.

Is there an additional voltage regulator in the coach or for the Sony ssm-721amr monitor.

The money pit begins,

Floyd
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Old 12-24-2013, 12:38 PM   #2
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Maybe check your ground. I had a similar problem with my camera and that was the problem. Renewed the ground and all was fine.
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Old 12-24-2013, 12:46 PM   #3
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Most things are set up to work in a range of 12-24 DCV, you have to figure out why the wire that supplys the voltage to your camera is at such a low voltage. How are your batteries? Above 12.5 VDC? Tke a meter and see what your voltage on your batteries is.
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Old 12-24-2013, 12:50 PM   #4
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Corroded connections on as 14 year old coach will do it every time. In place of money, work on cleaning them. I also have three meters which have readings spread over about half a volt so you have that challenge.
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Old 12-24-2013, 12:58 PM   #5
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Batteries are at 12 v. alternator putting out 14 v

Thanks for the response.
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Old 12-24-2013, 12:59 PM   #6
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I will take a look at that, thanks
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Old 12-24-2013, 01:19 PM   #7
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Quote:
Originally Posted by floydster View Post
Batteries are at 12 v. alternator putting out 14 v

Thanks for the response.
If your batteries are indeed at 12v then they are over 50% discharged. If your alternator is putting out 14v then the BIG question is why aren't your batteries being charged? Those voltages may well be the source of your back up monitor failure to operate.
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Old 12-24-2013, 01:44 PM   #8
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Quote:
Originally Posted by targaboat View Post
Corroded connections on as 14 year old coach will do it every time. In place of money, work on cleaning them. I also have three meters which have readings spread over about half a volt so you have that challenge.
My standard response for any electrical issues: Reseat all the connectors you can find several times.



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Old 12-24-2013, 01:46 PM   #9
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Correction, The RV battery is at 12.5 volts. As my other 4 vehicles are.

My bad.
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Old 12-24-2013, 01:48 PM   #10
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Try and locate a fuse location for your camera, check voltage there and move towards the source till you run into the problem........
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Old 12-24-2013, 01:50 PM   #11
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Originally Posted by floydster View Post
Correction, The RV battery is at 12.5 volts. As my other 4 vehicles are.

My bad.
I know you meant 12v as a generalization. If you find the fuse, clean those contacts too. I've been burnt by skipping that process. Don't forget the connector on the back of the monitor.



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Old 12-24-2013, 01:53 PM   #12
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will do........... thanks dunner
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Old 12-24-2013, 03:07 PM   #13
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1 to 2 volts low DC voltage at some device when the Battery voltage, from pos to the neg terminal, is 12.5 VDC, almost always is caused by a resistive ground at the device or occasionally a resistive connections in the 12 volt lead. Check the associated grounds, including a first check of the main battery bank ground to the chassis. Rook
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Old 12-24-2013, 05:08 PM   #14
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Thanks for the info Rook. Now all i have to do is trace the wires down.

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