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Wiring Harness Inspection

10 points

Overview

This assignment guides students in visually inspecting a wiring harness to identify common defects such as damaged wires, poor connectors, or insulation issues. Students will document their findings with a photo and a brief report, developing essential skills in harness condition assessment for safety and reliability.

Resources

FAA AC 43.13-1B - Chapter 11, Sections 8-12

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Assignment

Document Preparation

Copy this document to your own Coda E-portfolio page using the “Copy doc” button in the top right.

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Be sure to add it to the AT 209 section.

If you wish, you can hide this worksheet after completion by selecting “Hide page” from the page’s menu bar.

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Photograph Wiring Harness

Identify a wiring harness from an approved piece of equipment, such as a vehicle, plane, or training/simulator station.

Take a well-lit photo of the wiring harness.

Be sure to capture all ends of the wiring harness (it may run point to point or it may include several breakouts).

Upload your photo(s) to the

Photos⁠

section below.

Report of Findings

Conduct a brief visual inspection of the harness, focusing on the following:

Condition of the wires (check for cuts, cracks, abrasions, fraying, or exposed conductors)

Integrity of insulation and coverings (look for missing tape, damaged conduit, or heat damage).

Condition of connectors (check for corrosion, broken clips, loose or bent pins).

Signs of overheating (burn marks, melted insulation).

Routing and securing (whether the harness is adequately supported, tied down, and clear of moving parts or sharp edges).

Write a short

Inspection Report⁠

(½ to 1 page maximum) that includes:

The photo of the harness.

A summary of your observations. Be sure that your observations use language represented in

FAA AC 43.13-1B - Chapter 11, Sections 8-12⁠

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Any defects or concerns you noticed.

A recommendation (e.g., “harness is acceptable for use,” “minor repair needed,” or “should be replaced”).

Photos

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Inspection Report

The images captured were from my 2021 Infiniti QX50

Image 1: Overall Picture of Engine

Image 2: Intake Sensor Harness

Location: Engine bay, mounted on the intake duct

Description: A white 5-pin electrical connector attached to the Mass Air Flow sensor. This connector is part of the engine control harness and delivers sensor signals to the ECU for air/fuel calculations.

Condition:

Connector housing appears intact, no visible cracks or damage

Wire insulation shows no fraying or discoloration

Reliability: Secure and safe

Image 3: Battery / Fuse Box Harness

Location: Near the positive battery terminal

Description: Main harness bundle entering the fuse and relay box. This section distributes electrical power to vehicle systems

Condition:

No visible corrosion at the battery terminal or connector lugs

Harness sheathing shows no cracks, cuts, or wear from vibration

Reliability: Secure and safe

Summary

Both inspected harness areas are in good and safe conditions with no cracks, wear, or cuts from vibration. The most critical area for safety is the battery/fuse harness, because it distributes electrical power to vehicle systems. This section should be checked most frequently. In general, it is safest to make sure the wires are bundled and wrapped with a secure material to prevent any damage to critical systems. It was hard on my vehicle because it is fairly new. Therefore, there are a lot of plastic coverings, and there shouldn’t be any damage to the wiring yet.