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Disconnect the power supply connector from the rest of the power wire harness.
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Minus MUST connect to minus and plus MUST connect to plus or you WILL destroy your board and will need to buy a replacement.
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Read the wire labels. Red wire is always plus. Black wire is always minus.
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You can find little pluses and minuses on the RAMPS board next to the connector.
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Make sure to properly insert the power wires into the green RAMPS power connector, and tigten them very well. If you leave this connection loose, it may lead to excessive contact oxidation, excessive resistance, and eventually to a melted connector or fire.
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The wire ends (crimps, ferrules) are thick; you need to fully open the connector.
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fully open :-)
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not fully open :-(
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Almost done!
Finish Line