You can get these to connect other accessories to the LED Light Wiring Harness + Delay Relay , two different sizes available.
Note that the 2-pin connector is for use on CALI157x harnesses only. The 3-pin connector is for use with CALI174x harnesses only.
Neither of these are required if you're just hooking up one of C3's LED lights; those have the connector already built in
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