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Old 22nd Aug 2010, 10:29 pm   #6
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Default Re: Old car radio - how to change polarity?

Quote:
Originally Posted by murphyv310 View Post
It must have a dynamo as alternators are for negative earth.
Except for a few Lucas 10AC or 11AC types with separate control gear. I don't know about foreign makes......

BTW the procedure described is for converting a dynamo from +ve to -ve earth..... I think the opposite would be required here if the car does have a dynamo.

Knowing what the radio is would be the biggest help, as already commented.

The big picture is not clear, but it's not unlikely for a vintage car enthusiast to have an old radio (+ve earth) that he wants to use in a more recent car.
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Last edited by Herald1360; 22nd Aug 2010 at 10:35 pm.
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