Check your brake switch bumpers haven't deteriorated away on your brake pedal. https://conceptzperformance.com/nissan-infiniti-nissan-oem-clutch-brake-pedal-switch-bump-stop-nissan-240sx-300zx-46512-h0101_p_5090.php If they're intact, try adjusting your brake switch. If not that, your switch is stuck or an extremely unlikely short in the circuit. If your battery is only reading a flat 12v (should be 12.5 or 12.6) its discharged and only requires a recharge. If the battery is ok your ignition switch could be suspect if you get zero anything with the key in.
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