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FAQs

Match four things: voltage (12V or 24V), current rating (in amps — must equal or exceed the original), pin layout (3-pin, 4-pin, 5-pin standard automotive relays), and the pinout function (which pin is the coil, which is the common contact, which is normally-open and normally-closed). The pin layout is normally printed on the relay body; the original wiring must match. For a like-for-like replacement, OEM part number cross-reference is the safest path.

A mini relay is the smaller standard automotive relay — typically 25-40A current rating, used for most cab and chassis switching: lights, horns, fans. A maxi relay is the larger version — typically 50-70A current rating, used for higher-current loads: starter solenoids, glow plugs, large fan motors, fuel-pump circuits. Pin spacing differs between the two formats; relays are not interchangeable between mini and maxi sockets.

No. 12V and 24V components are not interchangeable. A 12V coil on a 24V supply will burn out the relay or solenoid; a 24V coil on a 12V supply will operate slowly or not engage at all. Always match component voltage to the equipment's electrical system — most cars and small plant run 12V; most HGVs, larger plant, and modern agricultural equipment run 24V. The voltage is listed on every electrical-component product page.

Yes — exact-fit horns and matched electrical components are available for the major plant, tractor, and commercial-vehicle OEMs. Search by the OEM part number where you have it, or by the equipment make and model. Where exact-fit isn't listed, generic 12V/24V replacements will fit most mounting points. WhatsApp 07754288583 with the OEM part number and equipment make for cross-reference of unlisted components.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

Electrical Components

Electrical Components covers the replacement and aftermarket electrical parts fitted to plant equipment, agricultural tractors, telehandlers, commercial vehicles, and the wider off-highway aftermarket — horns, flasher units, switches, relays, and the supporting electrical hardware used in plant and agricultural cab and chassis wiring. Parts For Machines supplies trade-grade electrical components for OEM, repair, and aftermarket use. Within Electrical Components you will find Horn (warning horns and air horns for plant and commercial-vehicle use), Exact Fit Horn (OEM-cross-reference horns sized to specific machine mounting points), Flasher Unit (turn-signal and hazard flasher relays), Switches (rotary switches, rocker switches, and battery-master switches), Relay (main, slave, and timer relays), and Mini & Maxi Relay (the standard automotive relay sizes used in plant and agricultural electrical systems). Product pages list voltage (12V or 24V — match to the equipment's electrical system; most cars and small plant run 12V, HGVs and most agricultural equipment run 24V), current rating (in amps — must exceed the load the component is switching), terminal type (spade, ring, screw, or specific connector), pin layout for relays (3-pin, 4-pin, 5-pin), and where applicable the OEM part number for cross-reference. For replacement of an existing component, the fastest path is matching the original by voltage, current, terminal type, and OEM part number where stamped. For relays, the pin layout and pinout function (which pin is coil, which is contact) must match the harness wiring. For switches, the body cut-out and panel-mount dimensions must match. For fleet workshops and plant-yard service operations, keeping standard relay and switch types as bay-side spares reduces downtime. Trade pricing on bulk and case-pack orders is available; contact the team via WhatsApp 07754288583 for a quote on volume requirements.

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