Land Rover Discovery Alternator: Specs, Fitment & Common Faults
A genuinely useful diagnostic technique: removing the alternator belt helps confirm whether it's genuinely the noise source — plus a simple rusty pulley fix, and an alarming finding about a cascade of warnings appearing before the battery light itself.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: LR072764 (genuine alternator — confirm via VIN) — aftermarket alternators Denso DAN1112 / Hella 8EL 015 637-571
| Alternators (aftermarket) | Denso DAN1112 (180 A, freewheel pulley, 6 ribs, 54 mm, new); Hella 8EL 015 637-571 (180 A, V-ribbed pulley, 6 ribs, 54 mm, new); AS-PL A0837S (180 A, belt pulley, 6 ribs, 53 mm, new, PL_2305); AS-PL A0839S (230 A, belt pulley, 6 ribs, 53 mm, new, PL_2305); AS-PL A6248 (150 A, freewheel pulley, 6 ribs, 53.5 mm, new, PL_2305); AS-PL A6248PR (150 A, freewheel, 52 mm, remanufactured exchange, no deposit); Rotovis 9091601 (180 A, freewheel pulley, 6 ribs, 54 mm, remanufactured, COM plug); Ridex 4G0286 (150 A, freewheel pulley, 6 ribs, 54 mm, new, LIN plug, excludes vacuum pump) |
|---|---|
| Outputs & variants | 150 A Denso-pattern units for the 2.0 Ingenium engines, 180 A Denso-pattern freewheel units (54 mm) for the 3.0 TD6/SDV6 diesels and 230 A Bosch-pattern units (53 mm) for the heaviest-load specifications. The D250/D300/D350 MHEV engines use a 48 V starter-generator rather than a standard alternator. |
| Genuine (OE) numbers quoted | AS-PL A0837S quotes 0125812017; AS-PL A0839S quotes 0125813022; AS-PL A6248 quotes 104210-2420. |
| Fitment notes | The 3.0 V6 diesel, the common UK engine, takes the 180 A 54 mm freewheel unit (Denso DAN1112 or equivalent); Walker and Stardax exchange references carry a core charge (£21.94 to £50.24) and the mild-hybrid variants need specialist attention. |
Land Rover Discovery Alternator: Often Blamed on the Battery Instead
On the Land Rover Discovery, dim lights, slow starts, a battery that won't hold charge — these symptoms point equally to a weak battery or a failing alternator, and that overlap is why so many replacements target the wrong part first, with the real problem only surfacing weeks later.
Land Rover Discovery Alternator: What It Does
Electricity generation while the Land Rover Discovery's engine is running is the alternator's job, charging the battery and directly powering the electrical systems. When it's working properly, the battery mostly just handles engine starting and short demand spikes, not day-to-day electrical load.
Land Rover Discovery Alternator: Watch: Replacing It
Shares the D7u platform and engines with Discovery 5; no Discovery 5 alternator video exists.
Opens live listings in a new tab.
A Genuinely Useful Diagnostic Technique Worth Knowing — Land Rover Discovery Alternator
If you're chasing a noise or electrical interference that might be coming from the alternator, this is genuinely worth trying: removing the alternator drive belt and starting the engine briefly can help confirm whether the alternator itself is genuinely the source — if the noise or interference disappears with the belt removed, this confirms the alternator; if it persists, the cause likely lies elsewhere, such as the ignition system. It's also genuinely worth knowing a simple, free fix worth trying first: a grinding or squeaking noise that worsens with engine speed has, in documented cases, been traced to a rusty alternator belt pulley, resolved entirely just by sanding the rust off the pulley surface.
It's also genuinely worth knowing that alternators from certain other Land Rover models have been documented as genuinely plug-and-play compatible replacements, worth researching whether a compatible unit from a related model exists before assuming only a specific, harder-to-source part will work.
Land Rover Discovery Alternator: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Alternator Guide for symptoms to watch for (plus a genuinely useful two-minute test to confirm it's not the battery instead), confirming the right amperage and fitment against your VIN, and which brands are worth trusting.
More Land Rover Alternator
The same part, covered across other Land Rover models.