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What should the amperage be for a fuel pump relay on a 2003 jeep wrangler

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  • wallygator67 Feb 05, 2010

    I know a relay is a switch but they are rated for how many amps they can handle. Ie you cant run 40 amps thru a 20 amp relay



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A relay should not draw amps it is only a switch. (OK perhaps a .02millivolt drop between the "in" volts and "out" volts) You should have 12volts or better (running voltage) at the pump harness connection and a good ground.

Posted on Feb 04, 2010

  • Richard Scordino Feb 05, 2010

    A relay is a switch. An amperage rating pertains to something that USES electricity. A switch (relay) is a mechanism that re-directs does not use it. The electro magnet in the relay is checked by reading ohms resistence and continuity, not amps. A light bulb, electric motor etc draws amperage, not a relay.



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