Make sure you use the appropriate shielded wire anchors spacing them frequently along the run. Use strap ties to hold groups of conductors together. Allow plenty of wire in the flex areas and secure each end using the appropriate connectors. Whenever the wire changes direction, place an anchor at the beginning and end of each radius. Do not bend the conductors sharply. When the conductors are subject to flying debris, heat, moisture, dirt protect them with an additional corrugated plastic shield. For examples of what to do and how to do it, just look under the hood of any trucks with factory wiring. You'll immediately notice the difference between that and when trunk monkeys have been at work. Do it like the factory to minimize future issues.
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