This is how I connect to an existing wiring harness/loom, Car wiring repair or adding accessories you may need to tap into a wiring harness, you'll need to cut it open, splice and reseal the harness to protect it.
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0:00 the start
0:48 cutting into a harness
1:18 opening it up
1:47 connecting the wires
3:12 insulating the join
4:22 tape the harness