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11-07-2018, 10:12 PM | #1 |
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Join Date: May 2010
Location: upstate SC
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40 radio on 12 volts neg ground
anybody got any ideas on how to do this--not for me, for a late friends daughter, she has been told she needs 12 volts and cannot be talked out of it
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11-07-2018, 10:57 PM | #2 | |
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Re: 40 radio on 12 volts neg ground
Quote:
The antique radio guy Joe, at the Mc Pherson restoration college in Mc Pherson Kansas converted my 1940 Zenith radio to AM/FM operation using 12 volt negative ground. He replaces most of the internal parts with modern parts and ties them to the original controls so the radio looks and works like an original radio. It is not cheap to do this about $500. |
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11-08-2018, 12:31 AM | #3 |
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Re: 40 radio on 12 volts neg ground
Here's Joe's web address .....
https://www.joesclassiccarradio.com/Resto.html I've collected web site addresses of five other radio repair/conversion guys from this forum over the years. If interested, you can get competitive prices. I've not had any of them do work for me so talk to them and ask around here about their service. Google their names and look for comments about them. Some of these web addresses are not secure likely because they are small outfits. Hopefully they are still active. http://www.classiccarradiorepair.com/index.html http://www.bobsradio.com/ http://dandmrestoration.com/services/radio-repair/ http://southtexasantiqueelectronics.com/inventory.html http://www.garytayman.com/index.html |
11-08-2018, 02:14 AM | #4 |
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Re: 40 radio on 12 volts neg ground
Had 'Turnswitch' convert mine to 12 volt negative ground with all the bells and whistles AM/FM,STEREO with inputs for MP3 player etc.
http://www.turnswitch.com/
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11-08-2018, 06:35 AM | #5 |
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Re: 40 radio on 12 volts neg ground
I was told that the radio did not know if it was positive or negative ground. I just put a voltage reducer in line and hooked it up and done the same thing with the gasoline heater, Voltage reducer is about $10.
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11-08-2018, 07:51 AM | #6 | |
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Re: 40 radio on 12 volts neg ground
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Quote:
Some modern types that are solidstate canīt. |
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11-08-2018, 08:13 AM | #7 |
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Re: 40 radio on 12 volts neg ground
thanks for the info, knew FB guys would know
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11-08-2018, 08:29 AM | #8 |
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Re: 40 radio on 12 volts neg ground
marv has it right polarty doe,s not matter .if you are happy with the am & don,t want to spend a lot of money just get a 12 to 6 v reducer. ps if the car is stock leave it 6 v . a 6v system in good order is fine with a stock car
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11-08-2018, 09:16 AM | #9 |
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Re: 40 radio on 12 volts neg ground
True that the radio is not polarity sensitive but, if there is a newer solid state vibrator installed, it is as I understand it, polarity sensitive.
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11-08-2018, 02:20 PM | #10 |
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Re: 40 radio on 12 volts neg ground
The old reed type vibrators will work either way on polarity but the voltage would have to be dropped as was mentioned. The old tube type radios can be altered for an outside MP3 player hook up but a person has to know where to connect and what other electrical components and such will keep the signal within usable parameters. The old radio set would need updated capacitors throughout too. A more modern speaker would likely be needed as well. The output would be mono but it would work OK.
The old radio sets are cavernous compared to the late type car stereos. To put a late set of radio guts inside would leave a lot of room in there. A person would likely have to add another speaker somewhere to utilize the stereo features. |
11-09-2018, 01:30 PM | #11 | |
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Re: 40 radio on 12 volts neg ground
Quote:
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11-09-2018, 03:36 PM | #12 |
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Location: Sugar Land, TX
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Re: 40 radio on 12 volts neg ground
I put in a small remote controlled $75 marine radio and hid it in a heater box on my 41. No heat required in Texas. I got a Turnswitch radio installed in an empty 36 radio box but was very expensive at $600-700. The first radio board they installed was horrible. Almost impossible to tune in a station and when you turned the car off and on again it wouldn't remember the station. I complained and Turnswitch said that is how it works, it being a feature not a defect. I had to pay another $300 to get the latest version of the board when a better one became available. I'm not a happy camper with them installing an unworkable radio board and making me pay to install another one that works. It does hook up to the original 36 radio knobs.
With all the PITA with Turnswitch I didn't go that route on my 41. https://flic.kr/p/2cGTh5d
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11-10-2018, 11:28 AM | #13 |
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Re: 40 radio on 12 volts neg ground
A few years back I think it was "Old Henry" here that posted how he added an MP outlet to his '46 radio.
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11-11-2018, 12:29 PM | #14 |
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Re: 40 radio on 12 volts neg ground
Anyone know about static interference on the AM side with the new modern AM-FM conversions? I have a single wire alternator and H10C Champion plugs in my 8ba engine if that makes any difference.
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11-11-2018, 01:32 PM | #15 |
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Re: 40 radio on 12 volts neg ground
Ford had a lot of ways to dampen RF noise that is generated by ignition, generator, sending units, etc. Most were handled by addition of capacitors added on to all the sources. They had kits for this. RF is also generated by outside sources from other motor vehicles, lighting with ballasts, and other transmission sources.
Depending on type of equipment used for alterations and type of antenna, there may be more sensitivity to this type of noise. Some radio sets can be adjusted somewhat to dampen sensitivity. |
11-20-2018, 02:53 PM | #16 |
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Re: 40 radio on 12 volts neg ground
I don't bother with radio. For travelling tunes I use a small car amp (you can pick 'em up on eBay for about $30) and an mp3 player on the seat beside me.
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