Maypole 7 Way Bypass Towing Relay 15Amp For 12v Towing Towbar Wiring - MP3877
Maypole Relay - 7 Way Bypass Relay 15Amp Bk - MP3877B. 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.