--- product_id: 164435024 title: "Maypole 12V 7 Way Bypass Relay with Audible Buzzer Trailer and Caravan Towing Electrics" brand: "maypole" price: "232.56 DT" currency: TND in_stock: true reviews_count: 13 category: "Maypole" url: https://www.desertcart.tn/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer store_origin: TN region: Tunisia --- # 12V DC coil voltage 7-way bypass relay for seamless trailer lighting Audible buzzer monitors indicators Maypole 12V 7 Way Bypass Relay with Audible Buzzer Trailer and Caravan Towing Electrics **Brand:** maypole **Price:** 232.56 DT **Availability:** ✅ In Stock ## Summary > 🚗 Light up your tow game with flawless control and smart alerts! ## Quick Answers - **What is this?** Maypole 12V 7 Way Bypass Relay with Audible Buzzer Trailer and Caravan Towing Electrics by maypole - **How much does it cost?** 232.56 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer) ## 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 - • **Reliable UK Engineering:** Crafted with precision in the UK, ensuring durability and compliance with CE standards. - • **Audible Indicator Alerts:** Built-in buzzer monitors turn signals and flashers, muting only during hazard warnings to keep you informed. - • **Hassle-Free Installation:** Surface mount design with clear instructions—recommended fitment by professionals for perfect performance. - • **Smart Circuit Differentiation:** Automatically distinguishes dual voltage tail/brake and tail/fog circuits for flawless lighting control. - • **Plug & Play 7-Way Compatibility:** Effortlessly integrates with most vehicles and trailer lighting systems, including filament and LED bulbs. ## Overview The Maypole 12V 7 Way Bypass Relay with Audible Buzzer is a high-performance towing electrics solution designed to seamlessly manage trailer and caravan lighting. Compatible with most vehicles and lighting types, it features smart circuit differentiation and an internal buzzer for indicator monitoring. Engineered in the UK with CE certification, it offers reliable, professional-grade performance and easy installation recommended by auto electricians. ## 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 - A 7 way bypass relay is connected directly to the vehicles lighting circuits to control the lights on a trailer and caravan - 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 or indicator monitor output to panel lamp or additional buzzer - Made in the UK - Fitment is recommended by an auto electrician or tow bar fitting centre ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07YWZ7KXF | | Best Sellers Rank | 1,043 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 438 Reviews | | Included Components | 1 x relay | | Item Type Name | MP3877B 12V 7 Way Bypass Relay | | Manufacturer | Maypole | | Manufacturer Part Number | MP3877B | | 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 Trailer and Caravan Towing Electrics - Image 1](https://m.media-amazon.com/images/I/715ukuabYqL.jpg) ## 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. ### ⭐⭐⭐⭐⭐ Perfect item that stops the cars brain having a fit. *by A***R on 21 April 2025* Fitted this to my 2009 Ford Focus, so as not to upset the cars brain when I fitted my tow-bar, works perfectly and great price. ## 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.tn/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer](https://www.desertcart.tn/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-05-31*