This shows how to change the polarity of power input into a Bendix car radio that was in a 1964 British Triumph TR4, which has Positive ground.

FYI: Info from the radio info sheet is:

TRADE NAME: Triumph Model 0-01000 (R2BT4)
SUPPLIER: Bendix Corp., Bendix Radio Div., Baltimore 4, Maryland
TYPE SET: 2 Tube -- 2 Transistor Auto Receiver
POWER SUPPLY: 12 Volt Storage Battery
RATING: 1.4 Amp. @ 12.6 Volts DC
TUNING RANGE: BROADCAST 540 - 1620KC

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