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Old 01-11-2009, 07:28 PM
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pos. ground

i'm putting a ele. fuel pump on a 1927 hupmoble that is pos.ground, and i need to know if i ground the pos. side and run a wire from the ing. switch to the neg. side of the fuel pump??

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Old 01-11-2009, 10:42 PM
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Yes, totally backwards from typical negative ground systems. 6volt and 12volt both.

Just make sure the pump is NOT grounded by the bracket/case and only by the wires. Most vane style fuel pumps will actually run backwards but will not pump fuel if you were to hook them up backwards electrically.

If you are still unsure, use a voltmeter to determine polarity at the point of connection.
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Old 01-13-2009, 03:05 PM
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Yup. sometimes its easier to think of it from the view of the electrical flow. The electricity is still flowing in the same direction. In a neg ground vehicle, the metal of the car is connected to the ground. On a pos ground vehicle, the whole car is connected to the positive side. So the juice is still flowing the same way, its just that you ground the positive side of the accessory, and "supply" juice through the neg wire.
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