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Old 03-27-2013, 08:28 AM
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Modern radio in a 6 volt system

OK I realize an East German built 28 hp 2 stroker is not a hot rod but since it has a 6 volt system I'm hoping you guys will understand.

I'm making slow progress but here is some current work. I still need to finish wiring up my fuel guage and radio and speakers.

Trabant Photos by turbofiat | Photobucket

OK so I am torn between using a period correct Panasonic radio in my Trabant or something more modern. I purchased a 6 to 12 volt converter but will be wired up through the ignition switch so it turns off with the key which will also turn my fuel guage off I've added.

What I am curious about will 6 volts provide enough power to keep the radio presets stored? Anyone ever done this?

If not can I connect the + of a 9V battery to the memory wire and ground the - to the chassis, will that work?

I really don't want to use a modern radio because it sticks out like a sore thumb but the advantage is it will fill in the grab handle hole in the dash, has a USB port to allow me to recharge my cell phone and has a slot for an SD card to where I can listen to my MP3s.

Also older radios are bad about picking up electrical noise and this one does. I bought a filter but don't know if it will cure the electrical noise. Newer radios have built in filters.

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Old 03-27-2013, 10:14 AM
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The radios with memory usually have a separate wire that needs to remain hot at all times. And another wire for ignition ON.
NOTE: make sure the speakers are connected to the radio before you apply power.
This is a case where a relay can be used to switch on power to the radio when the ignition is ON.
The 6/12volt converter will be connected hot-at-all-times and feeds 12 vdc the radio memory at all times.
The relay with a 6 vdc coil will switch the power to the radio when the ignition is turned ON.
A common general purpose relay with 6vdc coil and 10 amp contact rating should be adequate.

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