Description
Genuine Mack 20993302 OEM ignition / starter switch for Mack CHN, CHU, CXN, CXU, GU on-highway tractors and Granite vocational trucks. 1 in-32 panel-mount thread, key-operated four-position (off / accessory / run / start) circuit. Replaces former Mack service numbers 1MR4348M, 1MR4340M, 20775825, and 21514134.
Signs You Need a New Ignition Switch
- Key turns but the engine fails to crank or only cranks intermittently
- Dash lights or accessories cut out when key is held in run
- Key feels loose, sticky, or binds in the cylinder
- Starter continues to engage after the key is released
- Burning-electrical smell or melted connector behind the dash
Specifications
| Manufacturer | Mack (Genuine OEM) |
|---|---|
| Part Number | 20993302 |
| Part Type | Ignition / Starter Switch |
| Mounting Thread | 1 in-32 |
| Condition | New |
Cross References
This ignition switch replaces or is equivalent to the following part numbers:
- Mack: 1MR4348M, 1MR4340M, 20775825, 21514134
- PAI Industries: 804200OEM
Applications
This ignition switch fits the following Mack platforms:
- Mack CHN, CHU on-highway tractors
- Mack CXN, CXU (Pinnacle) on-highway tractors
- Mack GU (Granite) vocational trucks
Verify your VIN, dash harness, and the existing switch part number before ordering — Mack has used multiple ignition-switch designs across model years.
