Polarity Check



You have been directed to this page since we are not aware of the polarity of your vehicle. Vehicles can have standard polarity where the left pin of the injector is 12 volts or reverse polarity where the right pin is 12V.

Each vehicle is different so we are unable to obtain this information from the dealer or the manufacturer.

To perform this you will need a volt meter or multimeter. The photo above shows standard polarity. If the right terminal is 12 volts, then you need reverse polarity.

  1. Disconnect one of the injector connectors
  2. Turn your ignition to the on or run position. Do not start the vehicle*.
  3. Touch the black or negative probe from volt meter on the negative battery post or grounding point in the engine compartment.
  4. Touch the meter's red or positive probe to one of the injector connector's terminals.
  5. Verify which terminal is + 12 Volts. If the left side is 12V, then it is standard. If the right side is 12V then you need reverse.

*If you get no voltage during this procedure, you may need to have the engine running. It is normal for the check engine light to come on.

Please note: when holding your connector and testing it for 12V, it is important to hold it the same way as pictured below.

Please email us with the answer of standard or reverse polarity. Thanks for your help. If you have any questions, please feel free to contact us.

Bosch EV1 Fuel Injector Connector
Bosch EV1
EV1 Ford Low Profile Fuel Injector Connector
EV1 Ford Low Profile
Delphi Fuel Injector Connector
Delphi GM
Honda Fuel Injector Connector
Toyota Fuel Injector Connector
EV6 Fuel Injector Connector
Bosch EV6 Black
EV6 Fuel Injector Connector found on may GM engines
Bosch EV6 Gray Delphi
Nissan Fuel Injector Connector
Nippon Denso Fuel Injector Connector
Nippon Denso Top Slot
Toyota Fuel Injector Connector
Nippon Denso Bottom Slot