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Unread 11-08-2014, 02:32 PM   #1
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Default Switched radio, constant memory with reducer

Awesome Forum!!! First post! I have a challenge that I am trying to overcome regarding my radio setup on a 2012 48v CC Precedent. I have done the legwork of searching the forum posts endlessly to make sure the solution isn't already covered in 6 different threads. I haven't been successful at finding the answer I want...alternate solutions yes, the answer I'm looking for no...HA! So here goes. Like several others, I want to control the power to my radio at the key switch. I have this successfully wired today. I have a 48v to 12v reducer that has the + input to the reducer running through the key switch. This works great to power off the reducer, and subsequently, all the accessories on the 12v side of the reducer, including the radio, when the key is turned off. This also however, cuts the power to the radio memory, since the radio memory is also tied to the 12v side of the reducer...killing presets, etc. This is what I am challenging myself to resolve. I'm aware of the other options...second 12V battery, separate key switch, etc...but I want to see if there is a way to do this, solely by the single factory key switch (and a separate voltage reducer cutoff for longer term storage). I have a plan, but one required component in my design is something I don't even know if exists. I don't have a lot of experience in electronics or electrical knowledge other than very basic, so pardon any references or terms that aren't the right choice. I am providing a diagram I drew to help explain my thoughts. I want to install a rocker switch between the battery bank and the 48v + of the reducer (this will allow me to cut all power to the reducer for longer term storage, eliminating unnecessary battery drain...when this rocker is flipped in my design, I realize all radio presets will be lost, and that is acceptable as this will be infrequently). I want to install (and this is the component in question) some type of relay behind the key switch (which currently closes the 48v circuit for the cart when “on”) such that when the key is “on”, the relay is activated and the other side (being 12v rated), is inline between the 12v + output from the reducer and the radio 12v+, as well as any other 12v accessories. The memory wire from the radio would go to the 12v+ from the reducer "before" the relay between the key switch and the radio, to maintain constant 12v power while the rocker switch is closed. So the question is this: is there a relay or some other device (solenoid ?) that the mechanically switched side is high power and the magnetically switch side is low power……48v to 12v relay? As best I can understand, the intent of a relay is to allow a low power physical switching mechanism to force a higher power magnetically controlled switch. My design would require the exact opposite….does that exist? As mentioned, I have include a drawn diagram hopefully showing exactly what al the wiring would look like. Is this a possible solution? Again, I realize there are “easier” solution with secondary independent 12v batteries, just leave the reducer constantly powered (or toggle switched) and just power the radio off manually, but I want to determine if my design is possible or not before choosing one of the alternate solutions.
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Unread 11-08-2014, 03:23 PM   #2
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Default Re: Switched radio, constant memory with reducer

easiest way is to hard wire reducer to 48v with a kill switch for long term storage
then have radio power and memory on all the time
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Unread 11-08-2014, 05:33 PM   #3
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Default Re: Switched radio, constant memory with reducer

Memory draw is excessively low why not connect to one battery to keep presets? Can this not be done?
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Unread 11-08-2014, 06:19 PM   #4
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Default Re: Switched radio, constant memory with reducer

Quote:
Originally Posted by Epb View Post
Memory draw is excessively low why not connect to one battery to keep presets? Can this not be done?
yea i've done that
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Unread 11-08-2014, 06:30 PM   #5
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Default Re: Switched radio, constant memory with reducer

Could I direct run the memory wire to an 8V battery...would that work? I have 6 8V batteries
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Unread 11-08-2014, 06:41 PM   #6
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Default Re: Switched radio, constant memory with reducer

Nope already tried that! For some reason i thought you had 4 12's.
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Unread 11-08-2014, 06:46 PM   #7
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Default Re: Switched radio, constant memory with reducer

For radio preset memory you should be able to use a small battery or build a pack of camera batteries or something of that sort. Would likely last a long time.
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Unread 11-08-2014, 06:50 PM   #8
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Default Re: Switched radio, constant memory with reducer

Or 8 double a's.?..?
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Unread 11-08-2014, 07:58 PM   #9
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Default Re: Switched radio, constant memory with reducer

You could use recharable double a's and let the voltage reducer charge them when it is on. Then they would last longer.

Also just wondering if a capasistor could be used to hold the presets.
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Unread 11-08-2014, 09:51 PM   #10
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Default Re: Switched radio, constant memory with reducer

can't find the post but someone else had this problem and it was found that his radio needed the 12v ground to the same source as the 12v positive so other batteries would not work

edit ... he found a radio that had a built in battery for memory
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