If the wiring isn’t labeled already, label each wire or harness with the name of the components they route to. If the wiring or harness will be going through the firewall, use a grommet in the hole so the sheetmetal won’t cut through the wires. Don’t secure the connectors until the wiring is through the firewall.
The key to installing, troubleshooting, and repairing your own electrical system is simply making sure you have the right information and steps, and paying very close attention to detail through every step of the process. At a minimum, you should use a shop manual for your vehicle to analyze the engine wiring diagram and try to identify the wires by color under the hood. Unfortunately, the colors of the wire insulation may fade over time, so if your car is older, this task may be made more difficult.
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