on orders over £40 - Mainland Uk*
Car Regulators, Relays & Solenoids
Find Car Regulators, Relays & Solenoids for your vehicle
Enter your reg and we'll show you only parts that fit — no guesswork.
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
Browse all Car Regulators, Relays & Solenoids
Hella Main Power Relay 4RD 933 714-621
Description This Hella Relay, main current (Part Number 4RD 933 714-621) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 713-501
Description This Hella Relay, main current (Part Number 4RD 933 713-501) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-701
Description This Hella Relay, main current (Part Number 4RD 933 332-701) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-671
Description This Hella Relay, main current (Part Number 4RD 933 332-671) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-661
Description This Hella Relay, main current (Part Number 4RD 933 332-661) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-371
Description This Hella Relay, main current (Part Number 4RD 933 332-371) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-611
Description This Hella Relay, main current (Part Number 4RD 933 332-611) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-581
Description This Hella Relay, main current (Part Number 4RD 933 332-581) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-091
Description This Hella Relay, main current (Part Number 4RD 933 332-091) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-551
Description This Hella Relay, main current (Part Number 4RD 933 332-551) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-441
Description This Hella Relay, main current (Part Number 4RD 933 332-441) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-411
Description This Hella Relay, main current (Part Number 4RD 933 332-411) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-421
Description This Hella Relay, main current (Part Number 4RD 933 332-421) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-401
Description This Hella Relay, main current (Part Number 4RD 933 332-401) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-391
Description This Hella Relay, main current (Part Number 4RD 933 332-391) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-031
Description This Hella Relay, main current (Part Number 4RD 933 332-031) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-051
Description This Hella Relay, main current (Part Number 4RD 933 332-051) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-361
Description This Hella Relay, main current (Part Number 4RD 933 332-361) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-261
Description This Hella Relay, main current (Part Number 4RD 933 332-261) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-041
Description This Hella Relay, main current (Part Number 4RD 933 332-041) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-201
Description This Hella Relay, main current (Part Number 4RD 933 332-201) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-081
Description This Hella Relay, main current (Part Number 4RD 933 332-081) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-071
Description This Hella Relay, main current (Part Number 4RD 933 332-071) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsHella Main Power Relay 4RD 933 332-061
Description This Hella Relay, main current (Part Number 4RD 933 332-061) is OE-quality replacement, supplied for direct fitment to compatible vehic...
View full detailsAbout Car Regulators, Relays & Solenoids
Town Parts stocks a wide range of car regulators, relays & solenoids from established manufacturers includingFebi, Valeo and Hella. Enter your registration above and we'll narrow the list to car regulators, relays & solenoids 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 car regulators, relays & solenoids 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 car regulators, relays & solenoids 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 car regulators, relays & solenoids. 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.
About Car Regulators, Relays & Solenoids
Our car regulators, relays & solenoids 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 Town Parts
- 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.