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But Mad North-Northwest
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Well, start by making sure you have a good ground from the socket.

If that's not it, it's quite possible you've got a high resistance in the circuit somewhere else. If you can get to the connector to the reverse switch, try measuring the ohms across that with the switch closed.

You can also check the whole circuit (note that I'm assuming the power feed is +12 through the switch to the socket like in my '63, here). Disconnect the negative battery cable to be safe. Then put the car in reverse to close the switch and also turn the key to "on". Measure resistance from the positive terminal in the socket to the positive battery terminal: should have continuity and <1 ohm or so.

Be sure to turn the key back to off before reconnecting the battery.
 
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