Caltric Ignition Coil for John Deere 100 Series (105/107S/115) — Direct-Fit Replacement, OEM Cross-Refs

Caltric ignition coil designed as a direct-fit replacement for John Deere 100-series and select lawn tractor models, supplying the spark source required for reliable engine starting and consistent running.

If your John Deere 105, 107S, 115 or any listed 100 Series model is experiencing hard starts, intermittent spark, or misfires, this Caltric ignition coil replaces the factory unit using equivalent mounting and electrical connections. Built to match the listed part numbers (AUC11822, MIA11422, MIA12716) and physical dimensions, it’s intended for owners who need a straightforward swap without modifying the tractor’s ignition system.

Which John Deere models will this Caltric coil fit?

This coil is compatible with a broad range of John Deere 100 Series and related lawn tractors. Confirm fitment by comparing the unit and part numbers before purchase.

• Fits: John Deere 105, 107S, 115 and many 100 Series tractors
• Also fits: D100, D105, D110, D120, E110, L105, L107, L108, S100, S110, X105, X106, X107
• Cross-references: AUC11822, MIA11422, MIA12716 for accurate matching

How do the dimensions and form factor compare to the original coil?

The Caltric coil mirrors the original’s physical layout so it mounts and aligns with existing brackets and wiring harnesses. Key measurements help ensure the replacement will not interfere with surrounding components.

• Length: 78.1 mm (3.07 in) — matches the original footprint
• Width: 49 mm (1.9 in) — accommodates factory brackets
• Insulation outside diameter: 64 mm (2.51 in) — maintains clearance and electrical safety

What should I check before installing the replacement coil?

Verifying that the part matches your existing coil and the tractor wiring prevents install surprises. Take a few measurements and visual checks to confirm a correct replacement.

• Compare the posted product photo to your existing coil for shape and terminal locations
• Confirm part numbers and tractor model compatibility listed in the description
• Inspect mounting holes and electrical connectors for alignment and fit

What comes in the box and are there installation tips?

Each order contains a single Caltric ignition coil ready for installation. Basic hand tools are usually sufficient; follow safe battery-disconnect procedures and refer to a service manual for torque specs.

• Includes: 1x Caltric ignition coil, ready as a replacement unit
• Installation: disconnect battery, remove old coil, transfer mounting hardware, connect wires, test spark
• Advice: keep electrical connectors clean and secure to avoid intermittent faults

Who is this for: This Caltric ignition coil is aimed at owners, small-farm operators, and service technicians who maintain John Deere 100 Series and compatible lawn tractors and need an OEM-style replacement. It suits anyone seeking a like-for-like swap that preserves factory mounting, electrical connections, and dimensional fit—especially useful when restoring reliable ignition performance without modifying the tractor.