Quote:
Originally Posted by murphyv310
It must have a dynamo as alternators are for negative earth.
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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.