---
product_id: 164435024
title: "Maypole 12V 7 Way Bypass Relay with Audible Buzzer Trailer and Caravan Towing Electrics"
brand: "maypole"
price: "18.56 OMR"
currency: OMR
in_stock: true
reviews_count: 8
category: "Maypole"
url: https://www.desertcart.com.om/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer
store_origin: OM
region: Oman
---

# 7-way bypass relay for seamless trailer lighting 12V DC coil voltage Built-in audible buzzer for indicator monitoring Maypole 12V 7 Way Bypass Relay with Audible Buzzer Trailer and Caravan Towing Electrics

**Brand:** maypole
**Price:** 18.56 OMR
**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?** 18.56 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/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

- • **UK-Made Reliability:** Crafted in the UK with CE certification and backed by a 12-month warranty.
- • **Audible Indicator Alerts:** Internal buzzer monitors trailer signals, muting during hazards to keep you informed.
- • **Effortless Compatibility:** Works flawlessly with most vehicles & LED/filament bulbs—no more wiring headaches.
- • **Plug & Play Installation:** Surface mount design with solder connectors—recommended pro fitment for perfect setup.
- • **Smart Circuit Differentiation:** Separates dual voltage tail/brake & tail/fog systems for precise lighting control.

## Overview

The Maypole 12V 7 Way Bypass Relay is a UK-made, CE-certified automotive relay designed to seamlessly control trailer and caravan lighting. Compatible with most vehicles and LED or filament bulbs, it features a 12V coil, 15A current rating, and an internal audible buzzer that monitors indicator signals while muting during hazard warnings. Its smart circuit differentiation supports dual voltage tail/brake and tail/fog systems, ensuring reliable, load-free operation. Ideal for professional installation, it offers a durable, surface-mount design with solder connectors and a 12-month warranty.

## 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: 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.
Review: Perfect item that stops the cars brain having a fit. - 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.

## 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 | 1,205 in Automotive ( See Top 100 in Automotive ) 2 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 | 4.6 out of 5 stars 397 Reviews |
| Included Components | 1 x relay |
| Item Type Name | MP3877B 12V 7 Way Bypass Relay |
| Manufacturer | Maypole |
| Minimum Switching Voltage | 12 Volts (DC) |
| 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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Fantastic
*by G***H on 19 November 2025*

Can’t read this high enough straight swap from my old one that burnt out and works perfect no more light problems for me

## 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)

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**Shop now:** [https://www.desertcart.com.om/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer](https://www.desertcart.com.om/products/164435024-maypole-12v-7-way-bypass-relay-with-audible-buzzer-trailer)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-25*