Catalogue reference. Availability, exact specification and OEM or aftermarket supply are confirmed in your quotation.
Alternator component
alternatorPart number: 400-40103
J&N 400-40103 is a 12 V, 180 A high-output alternator with clockwise rotation, an internal regulator and fan, and a six-groove clutch pulley. Confirm mounting, electrical connections and suitability for the application before ordering.
Looking for J&N 400-40103? This catalogue reference is listed under alternator. Send the part number and your equipment details so we can confirm the specification, availability and a quotation including shipping.
Availability on request
Technical specifications
| Manufacturer | J&N |
|---|---|
| Part number | 400-40103 |
| Category | Electrical & controls |
| Availability | On request |
| Reference basis | Manufacturer part-number reference; supply origin requires quotation confirmation |
| Voltage | 12 V |
| Rated output | 180 A |
| Rotation | Clockwise |
| Regulator location | Internal |
| Fan location | Internal |
| Regulator clock position | 2:00 |
| Polarity | Negative |
| Pulley type | Clutch |
| Pulley grooves | 6 |
| Groove outside diameter | 52.9 mm |
| Pulley outside diameter | 58 mm |
| Mount hole 1 | 10.4 mm diameter, unthreaded |
| Mount hole 3 | M10 × 1.25, threaded |
| Mounting ear thicknesses | Ear 1: 13 mm; ear 2: 13 mm; ear 3: 26 mm |
| Terminals | B+: M8 × 1.25; C, S and L: spade |
Catalogue information may contain errors or be out of date. Full specifications and verified details are available on request. Confirm the part number and equipment fitment with us before ordering.
Product questions
What are the voltage and output ratings of the J&N 400-40103?
The 400-40103 is a 12 V high-output alternator rated at 180 A. It rotates clockwise and has an internal regulator and fan.
What pulley does the 400-40103 alternator use?
It has a six-groove clutch pulley. J&N lists a 52.9 mm groove outside diameter and a 58 mm overall pulley outside diameter; these are different measurements.
Will the 400-40103 fit a Nissan Altima or Sentra?
J&N lists certain 2007–2009 Nissan Altima and Sentra models with 2.5 L engines. A listing alone does not confirm fitment: provide the VIN or equipment serial number, engine details and existing alternator number for verification.
Does a 180 A alternator upgrade require special installation checks?
J&N recommends professional installation for a high-amperage upgrade, with particular attention to load-carrying cable size, battery condition and clean connections. Have the charging system assessed for the specific vehicle before installation.
Researched on:
Research information may be outdated. Confirm fitment and specifications with our team before ordering.