Connection explorer · Crack the Code
Every contact has a partner.
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Inspect the actual contacts
Connector
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Separate the connector
65% apart
The dashed guide joins the two selected contacts.
Seat connector
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Check the labels. Then align.
Traffic-light connections: R → R / D4; Y → Y / D5; G → G / D6; GND → GND. Disconnect power, match the printed labels and insert all four contacts together.