Draw the wiring once.
The paperwork builds itself.

$49.99 once — yours to keep. No subscription.

Aircraft wiring diagrams in the style of an airline wiring manual — with the wire list, pinouts, parts list, load analysis and wire labels all built from the same drawing.

For avionics installs, 337 and STC paperwork, troubleshooting — and builders wiring an experimental aircraft from scratch. One file, one-time purchase, runs on your own computer — no subscription, no server, no account.

Buy Once — $49.99 See Pricing See Everything It Does

Sample wiring diagram drawn in GA Wire Helper

What's Inside

Everything that usually lives in five different spreadsheets, kept in step automatically.

A schematic editor with a full symbol library — drag pin to pin to draw a wire
Automatic wire numbers: MIL-W-5088 style or airline bundle-wire-gauge style
Connection chart, pinouts, parts list and wire lists that update as you draw
Load analysis: bus and breaker loads, alternator margin and voltage drop per circuit
An interactive AC 43.13-1B Chapter 11 reference with a wire-size chart
Work-copy and 337 / logbook-copy PDFs with title block and signature lines
Shields, twisted pairs, overbraid and multiconductor cables, drawn the WDM way
Wire-number labels: stickers, heat-shrink sleeves, or a GRBL laser marker

Screenshots show a made-up sample installation on a fictional aircraft — not real approved data, and not a real manufacturer's pinout.

Draw it like a wiring diagram manual

Place parts from the + Add box, drag from pin to pin, and every wire is numbered, routed and fanned into its pin automatically. Select anything to edit it in the inspector — gauge, color, length, shielding, terminations and notes.

Diagram editor with the wire inspector open

Every wire, listed and checked

The connection chart lists every wire with its from/to, gauge, color, type, spec and length. Prefer lists to drawing? Build the whole job here instead, and the diagram follows.

Know the loads before you install

Bus and breaker loads against their ratings
Alternator load as a percentage of its output
Breakers too big for the wire they feed
Voltage drop summed along every circuit

Built in

AC 43.13-1B, one click away

The orange AC 43.13-1B button opens an interactive Chapter 11 reference: a wire-size chart read the same way as the AC's, circuit-protection and switch-derating tables, voltage drop, bonding, routing and wire identification.

Experimental & amateur-built

Building your own aircraft?

On a kit or plans-built airplane, the builder designs the electrical system — and often there's no manufacturer wiring diagram at all. GA Wire Helper lets you lay out the whole system before you cut a single wire, then gives you the paperwork to build it from:

Plan the panel — EFIS, engine monitor, radios, autopilot, lights — on one diagram, across as many sheets as you need
Size every wire and breaker against AC 43.13-1B, and check bus loads, alternator margin and voltage drop before you buy parts
A parts list with connectors, contacts, backshells and wire totals by gauge and color
Pinouts, wire lists and printed or laser-marked wire labels to build the harness from
A complete, accurate wiring diagram for the aircraft's records, its inspections, and every troubleshooting session after

Pinouts come from your own equipment's installation manuals — paste a pin table in and save the part for next time.

Works with GA MX Helper

Filed with the aircraft

Own GA MX Helper too? Link the two and GA Wire Helper picks aircraft straight from your fleet, then saves every project and PDF in that aircraft's Wiring Diagrams folder. Each aircraft profile in GA MX Helper gets a Wiring Diagrams tab listing them.

GA Wire Helper only ever reads your GA MX Helper data — it never changes it.

Draw the wiring once.The paperwork builds itself.