Constant 12v for new Radio

Wiring, lights, heater controls, anything electrical..
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fosterfarm
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Constant 12v for new Radio

Post by fosterfarm »

Hello,
I got a Retrosound stereo i'm trying to install and it needs 12V of constant power from the battery along with 12V ignition/ACC. Reference here: https://www.retromanufacturing.com/page ... your-radio

Has anyone installed a new stereo and has guidance here?

Thanks!

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MadMC63
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Re: Constant 12v for new Radio

Post by MadMC63 »

12V constant is typically power for the devices memory ( programed presets) and 12V switched is for operational power, on and off with the ignition switch, keyed. If you poke around the fuse box you should find both.
1971 Dodge D100
So what's wrong with setting beneath a single pull string incandescent light bulb writing angry letters?

fosterfarm
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Re: Constant 12v for new Radio

Post by fosterfarm »

MadMC63 wrote:12V constant is typically power for the devices memory ( programed presets) and 12V switched is for operational power, on and off with the ignition switch, keyed. If you poke around the fuse box you should find both.
Thanks! I have looked at the fuse diagram (here: download/file.php?id=33268&mode=view) and can't figure out which is which. I'm assuming "Radio 6A" is the switched 12V. Which location has constant 12V?

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MadMC63
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Re: Constant 12v for new Radio

Post by MadMC63 »

I think an industry standard is yellow equals 12V constant (memory) and red equals 12V switched power.
1971 Dodge D100
So what's wrong with setting beneath a single pull string incandescent light bulb writing angry letters?

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pwadventurer
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Re: Constant 12v for new Radio

Post by pwadventurer »

fosterfarm wrote:Thanks! I have looked at the fuse diagram (here: download/file.php?id=33268&mode=view) and can't figure out which is which. I'm assuming "Radio 6A" is the switched 12V. Which location has constant 12V?
4-way flasher/ cigar lighter is a constant hot on your fuse block.
Last edited by pwadventurer on Thu Jan 25, 2018 6:08 pm, edited 1 time in total.

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dodgeboykim
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Re: Constant 12v for new Radio

Post by dodgeboykim »

pwadventurer wrote:
Tue Jan 23, 2018 6:41 pm
Thanks! I have looked at the fuse diagram (here: download/file.php?id=33268&mode=view) and can't figure out which is which. I'm assuming "Radio 6A" is the switched 12V. Which location has constant 12V?
4-way flasher/ cigar lighter is a constant hot on your fuse block.
[/quote]


A light tester will determine that. Easy to figure that one out.
My truck is younger than me.
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Re: Constant 12v for new Radio

Post by PwrWgnDrvr »

The ACC terminal on the ign switch is "switched 12V", the + terminal on the ign switch is hot 12V all the time. Too simple!

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