Skip to content
Contact Us About Us Shipping Policy Refund Policy Privacy Policy Terms of Service
NN4 Online
Free mainland UK delivery on orders of £40 or more
0

Alternator

Finding parts that fit your vehicle.

Find Alternator for your vehicle

Enter your reg and we'll show you only parts that fit — no guesswork.

UK
Don't know your reg? Find manually
  • ✓ Free delivery on orders over £40
  • ✓ UK stock, dispatched from Northampton
  • ✓ Filtered to your specific vehicle from DVLA data
Top brands in Alternator
Bosch

About Alternator

NN4 Online stocks a wide range of alternator from established manufacturers including Bosch. Enter your registration above and we'll narrow the list to alternator that match your vehicle in the TecDoc catalogue. We always recommend confirming the part dimensions against your existing component before fitting, as specifications can vary between trim levels and engine variants.

All stock dispatches from our Northampton warehouse with free standard delivery on orders over £40 to most UK mainland locations. Browse the full alternator catalogue below, or use the registration lookup to filter to parts matched to your vehicle.

Frequently asked

How do I know a part will fit my car?

Enter your registration above and we cross-check against the TecDoc catalogue to narrow the list to alternator listed against your vehicle. Specifications can still vary between trim levels and engine variants, so we recommend confirming the part dimensions against your existing component before fitting.

What brands do you stock?

We stock established manufacturer brands sourced through trade channels. The brand row at the bottom of this page shows which manufacturers we carry for alternator. We don't sell unbranded parts.

How quickly will my order arrive?

Most orders dispatch from our Northampton warehouse within 1–2 working days. Free standard delivery on orders over £40 to most UK mainland locations.

What if the part doesn't fit?

Please check our returns policy for the current terms. If you're unsure about fitment for your specific vehicle variant, please contact our team before ordering using the details at the bottom of the site.

Can I check fitment before ordering?

Yes — every product page shows whether the part is listed against your selected vehicle. Where multiple sizes exist for the same vehicle, the dimensions are shown so you can compare against your existing part. If you're unsure, contact our team for help confirming the right option.

Brands for Alternator

We stock alternator from these manufacturers — each linked to a dedicated brand page with the full range:

Bosch Bosch

About Alternator

Our alternator range is built from established UK suppliers and trusted aftermarket brands. Each product is mapped against OE/OEM references and TecDoc ktype data so the reg-lookup above filters to only the parts that fit your specific make, model, engine and trim.

Enter your registration to see exact-fit options — or browse by brand using the tiles above. The full catalogue covers most major makes and models on UK roads, with same-business-day dispatch on stock items ordered before 2pm.

Bulbs, batteries and electrical parts

Electrical and lighting parts are some of the most frequently replaced wear items — headlight bulbs typically last 1-3 years depending on type, batteries 3-5 years in normal use, and other parts like alternators, starters and sensors are catch-it-early items.

Common signs to replace

  • Dimming headlights or a yellower beam — bulb output is dropping; replace in pairs (UK MOT requires matching).
  • Slow cranking on cold mornings — battery or alternator.
  • A dashboard warning light that wasn't there yesterday — pull the OBD code before guessing at the cause; many parts can throw the same warning.

Bulbs must match by pair

UK law requires both headlight bulbs to match in colour and output. Replace as a pair even if only one is failing — the second will follow soon and a mismatched pair can fail an MOT.

Why buy from NN4 Online

  • Reg-lookup fitment — see only the parts mapped to your specific vehicle.
  • UK warehouses — most stock items dispatch same business day on orders before 2pm.
  • Established brands — the brand tiles above are the full list available in this category.
  • Standard returns — handled per our returns policy linked in the footer.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare