When creating a wire, there are two workflows for defining the path that the wire follows. The wire can be created along:
a new path you define.
an exiting path.
Choose Home tab→Harness group→Wire 
.
Specify the keypoints or points in space you want to use to define the path and then click the Accept (checkmark) button on the command bar.
On the command bar, click the Properties button to display the Properties dialog box, which allows you to set the properties for the wire.
On the Properties dialog box, check the property values and make any needed changes.
On the Properties dialog box, click the OK button.
On the command bar, click the Preview button.
On the command bar, click the Finish button.
Tip:
You can construct the curve using keypoints on existing elements or points in free space.
Choose Home tab→Harness group→Wire .
On the Wire command bar, click the Use Existing Path button.
Set the method of selection to either Single or Chain.
Click the path near the end you want to be the starting point.
On the command bar, click the Accept (checkmark) button.
On the command bar, click the Properties button to display the Properties dialog box, which allows you to set the properties for the wire.
On the Properties dialog box, check the property values and make any needed changes.
On the Properties dialog box, click the OK button.
On the command bar, click the Preview button.
On the command bar, click the Finish button.