The Maypole MP3877 12V 7 Way Bypass Relay is a smart towing relay designed to safely connect your vehicle's lighting system to a trailer or caravan without placing additional electrical load on the vehicle's original wiring. Suitable for most modern towing installations, the relay ensures reliable trailer lighting operation while helping to protect sensitive vehicle electronics.
Designed to work with most vehicle types, the MP3877 is compatible with both traditional filament bulbs and modern LED trailer lighting, making it an ideal choice for a wide range of towing applications. It intelligently differentiates between combined tail/brake and tail/fog lighting circuits, ensuring the correct signals are sent to your trailer regardless of the vehicle's wiring configuration.
The relay incorporates a built-in audible buzzer that monitors the trailer indicators, providing an audible confirmation that the indicators are operating correctly. During hazard warning operation, the buzzer automatically mutes to avoid unnecessary noise. An additional ancillary flasher monitor output allows connection to a dashboard warning lamp or secondary buzzer if required.
Supplied with 55cm sensor leads for straightforward installation, the MP3877 can be powered directly from either the vehicle battery or fuse box. Manufactured in the United Kingdom and supplied in retail display packaging, it offers dependable performance and is an excellent solution for professional towbar installers and DIY enthusiasts alike.
Standard shipping is a flat £4.99 and is free on orders over £75. Orders using standard shipping are usually delivered within 1-2 working days of placing your order.
We will rush to dispatch your order same or next working day, but will contact you if there will be any delays. Please note that orders are not shipped on weekend or bank holidays.
A next day courier option is available for £6.99 - orders placed before 2pm will arrive the next working day, however any order placed after this time will not be dispatched until the following day.
If for some reason your order has not arrived within this time or if you have any queries regarding your order, please contact us.
If you wish for your order to be delivered to the following: Scottish Highlands, Northern Ireland or Isle of Wight/Isle of Man additional delivery charges may apply.
Please see our full delivery & returns policy and information here: Delivery & Returns Policy
