Check polarity, wire size and the matching connector before connecting your electronics.
Identify both halves
Similar housings can have different dimensions or pin arrangements. Check the precise connector family and its mating half.
Check polarity and rating
Verify the pinout from reliable component documentation. Wire gauge, connector current rating and installation quality must suit the intended load.
Inspect the finished connection
Look for damaged insulation, loose terminals and exposed conductors. Test continuity and polarity with the power disconnected before connection.