--- product_id: 164435024 title: "Maypole 12V 7 Way Bypass Relay with Audible Buzzer" brand: "maypole" price: "€ 64.93" currency: EUR in_stock: true reviews_count: 13 category: "Maypole" url: https://www.desertcart.com.cy/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer store_origin: CY region: Cyprus --- # 12V DC coil voltage 7-way direct vehicle connection Audible buzzer for indicator monitoring Maypole 12V 7 Way Bypass Relay with Audible Buzzer **Brand:** maypole **Price:** € 64.93 **Availability:** ✅ In Stock ## Summary > 🚛 Light up your tow game with smart, silent precision! ## Quick Answers - **What is this?** Maypole 12V 7 Way Bypass Relay with Audible Buzzer by maypole - **How much does it cost?** € 64.93 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer) ## Best For - maypole enthusiasts ## Why This Product - Trusted maypole brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Compatibility:** Works effortlessly with most vehicles and both filament & LED lamps—no compatibility worries. - • **Audible Indicator Alerts:** Built-in buzzer monitors trailer indicators, muting during hazards to keep you informed without distraction. - • **UK-Made Quality & Safety:** Crafted in the UK with no extra load on your vehicle’s electrical system—professional installation recommended. - • **Smart Dual Voltage Support:** Automatically differentiates tail/brake and tail/fog circuits for precise lighting control. - • **Seamless Trailer Lighting Control:** Directly connects to vehicle circuits for flawless trailer and caravan light management. ## Overview The Maypole 12V 7 Way Bypass Relay is a UK-manufactured, surface-mount relay designed for trailer and caravan towing electrics. It connects directly to vehicle lighting circuits, supporting both filament and LED lamps across most vehicle types. Featuring a built-in audible buzzer for indicator monitoring and dual voltage system compatibility, it ensures safe, reliable lighting without adding load to your vehicle’s electrical system. Ideal for professional installation, it’s the trusted choice for seamless towing light control. ## Description From the manufacturer MP3877B 12V 7 Way Bypass Relay A 7 way bypass relay is connected directly to the vehicles lighting circuits to control the lights on a trailer and caravan. The relays do not put any extra load onto the vehicles lighting system. The relays also feature a built in audible buzzer that monitors the trailer and caravan indicators. All bypass relays can be powered using either the battery or the fuse box. Works on most vehicle types and most filament bulb and LED lamp combinations Differentiates circuits on dual voltage tail/brake and tail/fog systems Monitors indicators / flashers via the internal buzzer, which mutes under hazard warning conditions Ancillary flasher/indicator monitor output to panel lamp or additional buzzer Made in the UK This towing bypass relay is compatible with vehicles that use multiplexed (shared-signal) wiring systems for position/brake and position/fog lights—as long as these signals are still present as physical wires at the rear light clusters. For other lighting functions, such as indicators, the relay requires separate signal wires running to each rear light cluster. It will not work with vehicles that use fully digital or network-based systems (such as CANBUS control) with no direct rear signal wiring. If you're unsure about your vehicle's wiring configuration, please consult a qualified auto electrician before purchase. Review: Perfect - Used to replace an identical unit, easy to wire, works great and when trailer not attached, doesn’t beep so no need to keep disconnecting it Review: Simple and Effective - Nice solution and easy to wire up, saved me sourcing the dedicated kit (Which was more expensive and very long delays in ordering) Instructions were clear, and all worked fine the first time post installation. ## Features - Direct Vehicle Connection: A 7 way bypass relay is connected directly to the vehicles lighting circuits to control the lights on a trailer and caravan - Wide Compatibility: Works on most vehicle types and most filament bulb and LED lamp combinations - Dual Voltage System Support: Differentiates circuits on dual voltage tail/brake and tail/fog systems - Indicator Monitoring: Monitors indicators and flashers via the internal buzzer, which mutes under hazard warning conditions - Additional Output Options: Ancillary flasher or indicator monitor output to panel lamp or additional buzzer - UK Manufacturing: Made in the UK - Professional Installation Recommended: Fitment is recommended by an auto electrician or tow bar fitting centre - No Extra Load on Vehicle: The relays do not put any extra load onto the vehicles lighting system, protecting your vehicle's electrical circuits ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07YWZ7KXF | | Best Sellers Rank | 1,426 in Automotive ( See Top 100 in Automotive ) 1 in Car Relays | | Brand | Maypole | | Coil Voltage | 12 Volts (DC) | | Connector Type | Solder | | Connector type | Solder | | Contact Material | Steel | | Contact Type | Normally Open | | Contact material | Steel | | Contact type | Normally Open | | Current Rating | 15 Amps | | Current rating | 15 Amps | | Customer Reviews | 4.5 out of 5 stars 455 Reviews | | Included Components | 1 x relay | | Item Type Name | MP3877B 12V 7 Way Bypass Relay | | Manufacturer | Maypole | | Manufacturer Part Number | MP3877B | | Maximum Switching Voltage | 12 Volts (DC) | | Minimum Switching Voltage | 12 Volts (DC) | | Model Number | MP3877B | | Mounting Type | Surface Mount | | Mounting type | Surface Mount | | Operation Mode | Automatic | | Product Warranty | 12 months | | Specification Met | CE | | Wattage | 5 watts | ## Product Details - **Connector type:** Solder - **Contact material:** Steel - **Contact type:** Normally Open - **Current rating:** 15 Amps - **Mounting type:** Surface Mount ## Images ![Maypole 12V 7 Way Bypass Relay with Audible Buzzer - Image 1](https://m.media-amazon.com/images/I/71RHDmS1XAL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: No instructions** A: Hello, you can find them on the Maypole website under Product Instructions **Q: Is this cambus suitably** A: It will not connect directly with cantus but if you can access the individual lamp wiring at the tail lamps, it will connect to and work with that. You will also need to provide a permanent fused 12v supply ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect *by X***X on 13 May 2026* Used to replace an identical unit, easy to wire, works great and when trailer not attached, doesn’t beep so no need to keep disconnecting it ### ⭐⭐⭐⭐⭐ Simple and Effective *by J***S on 5 August 2025* Nice solution and easy to wire up, saved me sourcing the dedicated kit (Which was more expensive and very long delays in ordering) Instructions were clear, and all worked fine the first time post installation. ### ⭐⭐⭐⭐⭐ Used for over a year and still operating perfectly *by G***R on 24 May 2026* I've had this fitted for over a year now (I've only just seen it in my Amazon review pile) as I needed it for my Thule bike rack. It works well, it still works well and I'm glad I purchased it. In my particular case I modified it a little as I had to disable the buzzer as the noise was causing the dog to bark/cry every time I put the indicator on. The change I made had no effect on the functionality of the relay. ## Frequently Bought Together - Maypole 12V 7 Way Bypass Relay with Audible Buzzer Trailer and Caravan Towing Electrics, Black - Maypole 7 Pin 12N Pre-Wired Towbar Socket Assembly Complete with 1.5m Cable, Flexible Gasket and Mounting Plate, Black - QitinDasen 50Pcs Quick Splice Wire Connectors Set, Quick Splice Terminal, Electrical Wire Splice Connector, Quick Connector Branch Connector (25Pcs Red + 25Pcs Blue) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.cy/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer](https://www.desertcart.com.cy/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer) --- *Product available on Desertcart Cyprus* *Store origin: CY* *Last updated: 2026-07-29*