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The bulb fitting is normally listed on the original bulb's body, on the bulb-holder, or in the equipment manual. Common indicator-bulb fittings: BA15s (single-contact bayonet, used on older equipment), BAU15s (offset-pin bayonet — preventing wrong-orientation fitting), P21W (21W single-filament bayonet), PY21W (21W amber single-filament for indicator-only use, where the lens is clear), W5W (5W wedge-base for sidelight). Match by the fitting code; the wrong fitting won't seat in the holder.

Yes — LED indicator-bulb replacements that fit standard tungsten-bulb holders are widely available, with longer life (typically 10x+ tungsten life), lower current draw, and cooler operation. The catch: LED bulbs draw less current than tungsten, and most original flasher relays use the bulb's current draw to time the flash rate. With LED bulbs, the flasher may cycle too fast (indicating bulb failure to the operator). Solutions: fit an LED-compatible flasher relay, or fit load resistors in parallel with the LED bulbs.

P21W is a clear 21W bulb — used in indicator fitments with an amber lens (the amber colour comes from the lens, not the bulb). PY21W is an amber 21W bulb — used in indicator fitments with a clear lens (the amber colour comes from the bulb itself). Always match the bulb to the lens: amber lens → P21W clear bulb; clear lens → PY21W amber bulb. Mismatched fitment may not give the correct amber indicator signal under the relevant compliance regulations.

Yes — match the bulb voltage to the equipment electrical system. 12V is standard on cars, light commercials, small plant, and some agricultural equipment. 24V is standard on HGVs, larger plant, most agricultural and industrial equipment. Wrong-voltage tungsten bulbs run dim (12V bulb on 24V — burns out instantly; 24V bulb on 12V — runs at fraction of brightness). LED indicator bulbs are typically voltage-specific (12V-only or 24V-only); some are wide-range (10-30V). The voltage is listed on every product page.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. 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.

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Auto- Indicator Lights

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Within Bulbs, Auto Indicator Lights covers the indicator and direction-signal bulbs and LED units fitted to plant equipment, agricultural tractors, telehandlers, commercial vehicles, and the wider off-highway and on-highway aftermarket — covering tungsten-filament indicator bulbs, LED indicator-bulb replacements, integrated LED indicator-light units, and the matching connectors, holders, and electrical hardware used in indicator and direction-signal circuits.

Parts for Machines supplies auto indicator lights across the trade and professional ranges. The category covers both standard tungsten-filament bulbs (in the common automotive bulb fittings — 12V and 24V variants) and the modern LED indicator-bulb replacements that fit existing tungsten-bulb holders without rewiring.

We are an authorised distributor and seller of Sealey across the indicator-bulb range, covering trade-grade replacement bulbs and LED replacements for plant, agricultural, and commercial-vehicle indicator-light fitments.

Product pages list the bulb fitting (the connector type and pin pattern — common indicator-bulb fittings include BA15s single-contact bayonet, BAU15s offset-pin bayonet, P21W and PY21W single-filament, PY21W amber for indicator-only use, and W5W wedge-base for sidelight-and-indicator combinations), the operating voltage (12V or 24V to match the equipment electrical system), the rated power (for tungsten — typical 21W for full indicator brightness; for LED replacements — equivalent power-or-greater output), the bulb colour (clear or amber — amber bulbs are required where the indicator lens is clear), and any certifications (E-mark for road-vehicle compliance). For LED-replacement of existing tungsten indicator bulbs, the LED replacement must be flicker-free and provide sufficient load for the original flasher relay (LED bulbs draw less current than tungsten — without sufficient load, some flasher relays cycle too fast, indicating LED failure). LED-compatible flasher relays or load resistors solve this. Trade pricing on bulk and fleet orders is available; contact the team via WhatsApp 07754288583.

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FAQs

The bulb fitting is normally listed on the original bulb's body, on the bulb-holder, or in the equipment manual. Common indicator-bulb fittings: BA15s (single-contact bayonet, used on older equipment), BAU15s (offset-pin bayonet — preventing wrong-orientation fitting), P21W (21W single-filament bayonet), PY21W (21W amber single-filament for indicator-only use, where the lens is clear), W5W (5W wedge-base for sidelight). Match by the fitting code; the wrong fitting won't seat in the holder.

Yes — LED indicator-bulb replacements that fit standard tungsten-bulb holders are widely available, with longer life (typically 10x+ tungsten life), lower current draw, and cooler operation. The catch: LED bulbs draw less current than tungsten, and most original flasher relays use the bulb's current draw to time the flash rate. With LED bulbs, the flasher may cycle too fast (indicating bulb failure to the operator). Solutions: fit an LED-compatible flasher relay, or fit load resistors in parallel with the LED bulbs.

P21W is a clear 21W bulb — used in indicator fitments with an amber lens (the amber colour comes from the lens, not the bulb). PY21W is an amber 21W bulb — used in indicator fitments with a clear lens (the amber colour comes from the bulb itself). Always match the bulb to the lens: amber lens → P21W clear bulb; clear lens → PY21W amber bulb. Mismatched fitment may not give the correct amber indicator signal under the relevant compliance regulations.

Yes — match the bulb voltage to the equipment electrical system. 12V is standard on cars, light commercials, small plant, and some agricultural equipment. 24V is standard on HGVs, larger plant, most agricultural and industrial equipment. Wrong-voltage tungsten bulbs run dim (12V bulb on 24V — burns out instantly; 24V bulb on 12V — runs at fraction of brightness). LED indicator bulbs are typically voltage-specific (12V-only or 24V-only); some are wide-range (10-30V). The voltage is listed on every product page.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. 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.

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