MSD 8210 Automatic Coil Selector for Dual Ignition Systems

The MSD 8210 Automatic Coil Selector is purpose-built for racers running redundant dual ignition setups. When competing in demanding race conditions, having a backup ignition system provides critical peace of mind — but manually swapping the coil wire mid-race is impractical. The MSD 8210 eliminates that problem by automatically switching to the correct coil the moment you transfer to your backup ignition.

The unit features two high-voltage posts that connect to the coil towers of each ignition coil, while a third post routes the selected coil's output to the distributor cap. When the driver activates the transfer switch to engage the backup ignition, the Coil Selector senses which coil is being fired and instantly redirects that voltage to the distributor — no manual intervention required.

Key Features:

• Automatically switches between primary and backup ignition coils
• Two coil tower input posts plus one distributor cap output post
• Ideal for dual MSD ignition system configurations
• Allows hot switching between ignition systems while the engine is running
• Compatible with emissions-controlled, non-emissions, and race-only vehicles

Requirements & Compatibility Notes:

• Requires two ignition control units, two ignition coils, and a single-pole double-throw (SPDT) transfer switch
• Not compatible with MSD 7 Series, 8 Series, or 10 Series ignition controls

The MSD 8210 Automatic Coil Selector is a simple, reliable solution for building a fully redundant ignition system — a setup commonly used in circle track and endurance racing applications.