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Old 04-06-2020, 07:11 PM   #1
US1
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Dash Radio remote switched powered, Why?

On my '00 Brave, the dash radio is powered by the dash switch: MAIN/AUX, to switch between the dash radio and the outside radio. Why would WB wire the dash radio in such a way, and not like every car/truck on the road that is powered thru the ignition switch? As it is, the only way the dash radio will work, is the key has to be on and that switch set to MAIN. As soon as the ignition is turned off, radio goes off and all the presets and the clock is lost.
This also prevents both radios from being on at same time, for those rare situations while parked you want both on.
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Old 04-06-2020, 09:18 PM   #2
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As built, I would expect that switch to let you power the dash radio from the chassis (MAIN) or coach (AUX) batteries. The ignition would need to be in ACC or ON if the chassis batteries are selected. In either case I would expect the presets, etc. to be retained by the radio. To use the radio you would typically use the chassis batteries when driving and the coach batteries when stopped.

I would not expect that switch to have anything to do with the outside radio.
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Old 04-06-2020, 09:32 PM   #3
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Our 06 Outlook c-class has the same switch to supply power to the dash radio. The main(chassis) and Aux(coach) allows the dash radio to be used while parked and controlled by ignition switch while driving, automatic off when ignition is off.
There is also an electrical 'gizmo', electronic experts will know the name of it. This allows the radio station memory to be retained during the 1/2 second switch over.

Ken
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Old 04-07-2020, 05:09 AM   #4
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There should be a seperate always hot wire going to the radio that keep the presets alive.

It will be fused and may be blown or not connected.
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Old 04-07-2020, 05:39 AM   #5
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US1, the top switch just to the right of the instrument panel is the switch for radio power AUX or MAIN.
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Old 04-07-2020, 05:51 PM   #6
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Well, with the responses from you guys, just got done messing with the radio.
And you are correct, the switch dictates the battery selection and not the radio. Also found that the fuse for radio on the "AUX' side was blown, further confusing the understanding of it. Outside radio is powered by the salesman swtch fully

It becoming appearant that when trying to distinguish what does what as far as the 12v coach side, it never occured to me if the RV is plugged in to shore and its powered up, that plays havoc chasing circuts down even though I switch off the salesman switch. Why are my 12v features still working when I turned the switch off? Now its all starting to come together the more I learn the workings of my 1st rv.

Back to the radio..... From looking at the wiring schematic, the radio memory is powered at the MAIN/AUX dash switch from the lead coming from the salesman switch. As long as thats left on, Im good to go. But as soon as the switch is turned off, all the presets and clock are gone. If I leave that switch on and the RV is not plugged in to shore, the house batteries have a small draw, which I have just learned today, that draw is from the battery isolator solenoid.
So it looks like I'll be resetting the clock and settings every time we take in the RV.
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Old 04-07-2020, 08:03 PM   #7
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Quote:
Originally Posted by cbeierl View Post
As built, I would expect that switch to let you power the dash radio from the chassis (MAIN) or coach (AUX) batteries. The ignition would need to be in ACC or ON if the chassis batteries are selected. In either case I would expect the presets, etc. to be retained by the radio. To use the radio you would typically use the chassis batteries when driving and the coach batteries when stopped.

I would not expect that switch to have anything to do with the outside radio.
You described exactly how my dash radio works. The bedroom radio and outside radio are totally separate installations.
It sounds like someone has "fixed" US1's switch.
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Old 04-07-2020, 09:13 PM   #8
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Most radios have a separate fused
B+ feed just to keep memory alive. It may come off chassis battery or may come from house bank. I have a hard time believing that WB didnít provide continuous radio memory.
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Old 04-08-2020, 12:44 PM   #9
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Can someone confirm that their radio does not loose the time nor presets when the coach switch is switched off? On 1 hand I can see the reason behind it, kill it all. Mine is the original radio and the wiring looks factory, so it came this way new

Thanks
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Old 04-08-2020, 05:18 PM   #10
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My 06 Winnie does not lose the presets or clock time, except when I disconnect the battery(ies) at the battery posts, either coach or chassis, depending on which position the radio power selector is in.
The dash radio battery selector switch. Gets power on the chassis side from the ignition on for radio power and 'hot' all the time chassis source. On the coach battery side, the radio power is picked up after the 'disconnect' switch so the radio is off when the batteries are disconnected by the switch. The memory 12v is picked up before the disconnect switch (it's one of the phantom draws when you think that the batteries are disconnected.
The switch on mine is a Double Pole/Double Throw , no off position. The two outside terminals on one side are power in from coach batteries system and on the other side are from the chassis side. The centre out are to the radio, one for radio power and one for radio memory. The radio memory out has a mini battery (technical term??) inline to prevent a momentary power loss (memory loss) when switching between the two battery systems.
Personally mine is on the coach side 99% of the time, but then never use the battery disconnect switch.

Ken
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Old 04-08-2020, 05:49 PM   #11
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My guess is that someone replaced the battery disconnect solenoid and put that radio memory wire on the wrong terminal of it.

You may be able to Buy a 9 volt battery and the little connector for it and hook it to the memory wire and ground.

Change it every year or so.
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Old 04-08-2020, 06:35 PM   #12
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Thanks guys for the replies.
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Old 04-08-2020, 07:16 PM   #13
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I never understood the reason for the Main/Aux switch. I removed ours and run the Pioneer Infotainment unit off the house batteries exclusively. I repurposed the hole in the dash for a Carling switch for some overhead lights I made.
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Old 04-08-2020, 07:22 PM   #14
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Quote:
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I never understood the reason for the Main/Aux switch. I removed ours and run the Pioneer Infotainment unit off the house batteries exclusively. I repurposed the hole in the dash for a Carling switch for some overhead lights I made.


Exactly how my Newmar is wired. If you want the radio off you have to turn the radio itself off.
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