Two main factors determine the type of harness.
The first is application, and the second is environment. Based on these two factors, there are three types of harnesses that you can do.
Open Bundle:
They include:in this type of wiring harness, the cables are attached to the connectors and lugs and are coupled in bundles with various breakouts using plastic tie wraps or waxed lacing twine.
Closed Bundle:
The metal wire is wrapped in a layer of covering, such as pulling up a braided tube, braiding on Nomex or nylon, or in some cases, a metal braid.
Waterproof harnesses:
The legs are covered with tubes, such as neoprene. The joint between the legs of the connecting piece and the back shell is made of polyurethane or rubber compound.
In some cases, PVC tubing and molding are used.