Alternator for John Deere 1420, 1435, 1445, 1545 & 1565 Mowers - 55 Amp
Alternator for John Deere 1420, 1435, 1445, 1545 & 1565 Mowers - 55 Amp
SKU:400-52139
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Alternator for John Deere Front Mowers & Compact Tractors
12-Volt, 55 Amp - Replaces John Deere AM880701 / MIU800942
This alternator is a direct replacement for the original unit fitted to John Deere front mowers and compact utility tractors powered by Yanmar diesel engines, superseding John Deere part numbers AM880701 and MIU800942. It is manufactured to OEM specifications for fit, form and function.
The unit is rated 12-volt, 55-amp with clockwise rotation, an internal regulator (IR) and internal fan (IF), in the Denso design used as original equipment. It uses a single-groove (V1) pulley measuring 69mm OD with a 15mm ID, designed to run on a 13mm belt, and is fitted with an IG-L (T-shaped) plug.
Key Features
- 12-volt, 55-amp output
- Clockwise (CW) rotation, Denso design
- Internal regulator (IR), internal fan (IF)
- Single-groove V1 pulley, 69mm OD x 15mm ID
- IG-L (T-shaped) plug
- Covers 1400 and 1500 Series front mowers and 2000/4000 Series compact tractors
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 55A |
| Rotation | CW (clockwise) |
| Manufacturer | Denso |
| Pulley Type | V1 (single groove), 69mm OD / 15mm ID |
| Belt Width | 13mm |
| Plug Type | IG-L (T-shaped) |
| Fan Type | IF (internal) |
| Regulator Type | IR (internal) |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model | Years |
|---|---|
| John Deere 1420, 1435, 1445, 1545, 1565 Front Mowers (Yanmar diesel) | All model years |
| John Deere 1203, 1505, 1515, 1905 Mowers (Yanmar diesel) | All model years |
| John Deere 1600, 1600 Turbo, 1620 Wide Area Mowers (Yanmar diesel) | All model years |
| John Deere 2025R, 2027R, 2032R, 2320, 2520, 2720 Tractors (Yanmar diesel) | All model years |
| John Deere 4100, 4110 Compact Utility Tractors (Yanmar diesel) | All model years |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| AM880701, MIU800942 | John Deere |
| 101211-2200, 101211-2201 | Denso |
| 129052-77220 | Yanmar |
| AND0436 | Arrowhead |
| 12351 | Lester |
| 400-52139 | J&N Electrical Products |
Frequently Asked Questions
Will this fit my John Deere mower or tractor without modification?
Yes, this unit is manufactured to OEM specifications and bolts directly into the standard mounting points used on Yanmar diesel-powered John Deere mowers and compact tractors.
What's included?
The alternator unit only.
How can I tell my alternator has failed?
Signs include a charge warning light, a battery that will not hold charge, dimming lights, or unusual noise from the unit.
How do I confirm this is the correct alternator?
Check the number on your original unit against the table above - John Deere AM880701 or MIU800942, or Denso 101211-2200 / 101211-2201.
What plug does this alternator use?
An IG-L (T-shaped) plug, matching the original Denso-manufactured unit.
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