🚛 Tow Smarter, Not Harder: Stay Connected & Alert on Every Journey
The Maypole 12V 7 Way Bypass Relay with Audible Buzzer is a precision-engineered towing electrics solution designed to seamlessly control trailer and caravan lighting. Compatible with most vehicles and both filament and LED lamps, it features smart indicator monitoring with an internal buzzer that mutes during hazard signals. Made in the UK and CE certified, this relay ensures reliable, professional-grade performance for all your towing needs.
| Manufacturer | Maypole |
| Part number | 3877 |
| Item Weight | 140 g |
| Product Dimensions | 18 x 15.8 x 3 cm; 140 g |
| Item model number | 3877 |
| Colour | Black |
| Style | technical |
| Material | Brass |
| Pattern | Single |
| Power source type | Corded Electric |
| Wattage | 16.4 watts |
| Item Package Quantity | 1 |
| Measurement System | Inch and Metric |
| Plug profile | Screw Mount |
| Specification met | CE |
| Included components | 1 x relay |
| Batteries included? | No |
| Batteries Required? | No |
J**H
Relay 7 pin
Thanks works good
S**T
works perfect and makes everything work
was fitted to a fiat qubo, easy to read instructionsand small size, plenty of wiring supplied with unit as well
A**N
Find about you vehicle wiring colour codes before you start And what side they are send down
Fitted this to a 04 regVW touran fast post good price.The instructions are a bit poor but YouTube is the way to go it took a good 4 hours but was talking care soldered all the connections. Doesn't come with inline fuse or holder. But I had one anyway. It works but doesn't beep but that could be because am using LED lower resistance . But no dash lights saying there's a problem so all is good.Will try some normal lights one day maybe LEDs needs a resistor.
T**E
Very clear instructions
Very clear instructions easy to fit
H**R
Works well, but no instructions!
This relay works impressively well - once installed - and that’s why it got 4 stars! On the packaging it clearly states, ‘Instructions Included’, but they simply weren’t. There was mention of a website, but going there led to an indecipherable list of loads of different products, none of the links having the same number as any part number on this item - a tedious search was needed… Even when I found the right link, there was no wiring diagram, just words, nothing like as intuitive as visuals… So, 3 websites later I had instructions and could install. The only nuisance in use is that occasionally the turn-indicator beeper ‘warbles’ unpleasantly and sounds cheap. It’s great value and - subject to these reservations - recommended.
I**L
perfect product
these relays are the only one I will use and have fitted hundreds, never had one break or give a problem, if you are fitting a tow bar then it pays to use the best relay.
J**M
Maypole, Good stuff as usual!
Maypole, Good stuff as usual. This unit appears to contain small relays powered separately by a power connection which is supplied from the battery / fuse box. This means that the existing wiring does not have much additional load, just enough to turn on the relay(s) The Buzzer for the indicators is pretty loud as well, can't ignore it.
D**Y
It's fantastic but instructions poor but go on the Web for help
Beeps when either indicators on trailer are working.. No damage to cars electrics really really good
Trustpilot
1 month ago
2 months ago
