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🚗 Light up your tow game with flawless control and smart alerts!
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.


| ASIN | B07YWZ7KXF |
| Best Sellers Rank | 887 in Automotive ( See Top 100 in Automotive ) 1 in Car Relays |
| Brand | Maypole |
| Coil Voltage | 12 Volts (DC) |
| Connector Type | Solder |
| Contact Material | Steel |
| Contact Type | Normally Open |
| Current Rating | 15 Amps |
| Customer Reviews | 4.5 4.5 out of 5 stars (432) |
| 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 |
| Operation Mode | Automatic |
| Product Warranty | 12 months |
| Specification Met | CE |
| Wattage | 5 watts |
N**T
So easy
Worked Perfectly on a Smart 421 with a manufacturers bike rack that we purchased 2nd hand well happy
J**S
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.
A**R
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.
D**E
Maypole trailer wiring kit
It's a quality item but it doesn't come with any wiring diagrams so you need to know trailer wiring or do what most will do and look on Google
X**X
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
A**C
Works Perfect
Replaced an old one on my Insignia..been working fine since.
S**F
Teamwork
I have two of this . Ordered a second one because the right indicator wasn’t working . The new doing the same thing . Finally I sorted the problem whit two of this one is the left, the other one is the right. Maybe just for me I don’t know . But not working as it’s should .
G**K
Tow item
Easy to fit despite no instructions with it so you may need to look online
A**R
This item is brilliant on my daughters van with the battery under the seat. Works well, and has a very good range even though its under the seat
P**É
Très bon produit ,très facile à comprendre et à monter à acheter sans problème
A**Y
Ottimo prodotto
X**R
Instal.lat en un renault laguna substituint el mateix model. Porta feina la instal·lació però els llums del remolc ara van bé. A més aquest model fa uns pitidos els intermitents quant està el remolc connectat
M**M
Priceworthy
Trustpilot
1 month ago
1 month ago