The 10-821644-6 ignition dual harness is a magneto ignition wiring assembly used on Continental piston aircraft engines. It distributes high-voltage output from dual magnetos to the engine’s spark plugs through insulated leads and terminals.

It is designed as a complete dual system harness, meaning it routes ignition energy for all cylinders from both magnetos, ensuring redundancy and continuous engine operation even if one ignition side fails.

Key features include:

Dual ignition harness (supports both magnetos)
High-voltage insulated ignition leads
Terminal ends matched to aircraft spark plugs
Designed for Continental engine configurations (model-dependent IPC use)
Heat- and oil-resistant harness construction
Engine vibration-resistant routing and bundling
Supports redundant ignition system operation
Pre-terminated harness for magneto installation
Used in certified aircraft engine ignition systems
Installed during engine maintenance or overhaul procedures