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Cessna 172 Alternator Circuit Diagram

Type Circuit schematicStandard IEEE Std 315 / ANSI Y32.2Engine schematex-circuitUpdated 6/11/2026
Cessna 172 Alternator Circuit Diagram
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The scenario

A pilot or mechanic wants to understand the alternator circuit wiring in a Cessna 172 for troubleshooting or maintenance.

What is in this drawing

Read the decisions behind it.

01

Battery isolation with master switch and fuse

02

Alternator output with reverse-current diode

03

Field control via separate switch

When documenting or simulating a typical light aircraft electrical system, or teaching aircraft electrical fundamentals.

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