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10-27-2019, 08:44 PM | #1 |
Senior Member
Join Date: May 2012
Location: Klawock, AK/Kanab, UT
Posts: 301
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Radio Polarity Help Needed
My 47 came with a 6 volt Optima battery and a one wire alternator. It had and still has a negative ground. I have had the radio repaired and want to get it working but am unsure about hooking up to the negative ground. It seems I would have two options:
1. Reverse the polarity back to positive ground. Would that make any difference to the alternator? I know the ampmeter woud read backwards but I think everything else would be fine. Any comments? 2. Send the radio off to be modified to work on negative ground. I have heard this is possible but I'm not sure. 3. Do nothing and hope that the polarity is not going to be a problem. I dont want to do this unless someone with more knowlege has done it without a problem. |
10-28-2019, 02:01 AM | #2 |
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Join Date: Apr 2015
Location: Sweden
Posts: 3,045
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Re: Radio Polarity Help Needed
The person repairing it would be able to tell you if it will work on neg. ground or not...it depends a lot on what was exhanged and if it has a solidstate vibrator in it now...
And alternators donīt polarize like a generator they have diodes in them that set if they are pos. or neg. ground...so donīt try and reverse it ! |
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10-28-2019, 04:45 AM | #3 | |
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Join Date: May 2010
Location: CLAYTON DE
Posts: 1,283
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Re: Radio Polarity Help Needed
Quote:
Or MacGyver a way to insulate the casing from grounding out. Use the power input for ground. Then supply power to the casing. Best tho is to get help from a pro, for a cleaner set up. Good Luck Just thinking I know radio repair guys are not as prevalent as they once were. But one area that still lives on is the truck CB shops. Asking in your friendly truck stop may get you what you need.
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Enjoy yer day. Tom Hate can't fix what it started. Last edited by A bones; 10-28-2019 at 04:54 AM. Reason: more |
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10-28-2019, 08:23 AM | #4 |
Senior Member
Join Date: Oct 2014
Location: NE Iowa
Posts: 1,664
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Re: Radio Polarity Help Needed
Tried to use early VW 6 volt in a Ford once. Insulated it real good and blew it when antenna cable got plugged in. Forgot antenna cable coax is hooked to the car body on the mast mount.
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10-28-2019, 09:19 AM | #5 |
Senior Member
Join Date: May 2012
Location: Klawock, AK/Kanab, UT
Posts: 301
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Re: Radio Polarity Help Needed
I have tried to contact the person who repaired it but get no answer. I will have to locate someone new if possible. Thanks to everyone for the advice and tips.
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10-28-2019, 09:50 AM | #6 |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Radio Polarity Help Needed
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10-28-2019, 09:56 AM | #7 |
Senior Member
Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
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Re: Radio Polarity Help Needed
I used to have a '47 and changed the polarity of it. As I recall, there was one capacitor in it the needed to be switched around. Best to get a schematic and have a radio tech look it over. It is relatively simple.
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