Alternator for John Deere 3320, 3520 & 3720 Tractors - Replaces MIA10222
Alternator for John Deere 3320, 3520 & 3720 Tractors - Replaces MIA10222
SKU:400-40050
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Alternator for John Deere 3320, 3520 & 3720 Tractors - Replaces MIA10222
Fits John Deere 3320, 3520 & 3720 Utility Tractors, All Years
This 12-volt, 70-amp alternator is a direct aftermarket replacement for the John Deere 3320, 3520 and 3720 utility tractor range, built to OEM specifications as a like-for-like fit for the original MIA10222 unit. It uses an internally regulated (IR) charging system with an internal fan (IF) design.
Built as a fit-and-function equivalent to the original equipment, no wiring or bracket modification is required. Note that the rectifier's P-terminal is visible on this unit - the original equipment may have had a small plastic cover fitted over it, which does not affect function.
Key Features
- 12-Volt, 70-Amp charging output
- Internally Regulated (IR), internal fan (IF) design
- Direct replacement for OEM MIA10222
- 1-V pulley, 62.3mm OD
- 12-month warranty as standard
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 70A |
| Rotation | Clockwise (CW) |
| Regulator | IR (Internally Regulated) |
| Fan Type | IF (Internal Fan) |
| Pulley | 1-V, 62.3mm OD, Pulley Class V1 |
| Clock Position | 2 |
Vehicle Fitment Guide
| Make & Model | Years |
|---|---|
| John Deere 3320 Utility Tractor | All years |
| John Deere 3520 Utility Tractor | All years |
| John Deere 3720 Utility Tractor | All years |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| MIA10222 | John Deere (OEM) |
| V600140, 600140 | Arrowhead / Valeo |
| 208-5049 | Lester |
| AVA0127 | J&N |
| A3375 | Valeo |
Frequently Asked Questions
Will this alternator fit without modification?
Yes. This is a direct fit-and-function replacement for the OEM MIA10222 unit fitted to the John Deere 3320, 3520 and 3720 range, using the same mounting, pulley and electrical connections.
What's included?
The alternator unit only. Pulley and bracket are as fitted; existing wiring and drive belt are reused from your original unit.
How do I know my alternator has failed?
Common signs include a charge/battery warning light staying on, dimming lights, slow cranking, a flat battery despite normal use, or a whining/grinding noise from the unit.
Why is the rectifier's P-terminal visible on this unit?
The original equipment may have fitted a small plastic cover over this terminal. Its absence does not affect the alternator's function or fitment.
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