TF1152 Superbuzzer2 Boot-fitting Audible Monitor   

This a very simple device consisting of a buzzer and two monitoring circuits, one circuit for each side of the vehicle. It is designed to be fitted in the rear part of the vehicle, close to the rear lamp clusters.  When current passes through either trailer flasher circuit, it is detected and the monitor circuit causes the buzzer to buzz.

Photo1152
It has five wires for connection: 
   earth for the buzzer (white)
   left hand input wire (yellow/white)                                                            
   left hand output wire (yellow)
   right hand input wire (green/white) 
   right hand output wire (green)
It is fitted in line between the vehicle's flasher circuits and the wires that carry current via the towing socket to the trailer's indicator lamps.
It only buzzes when current passes through it to the trailer flasher lamps. Thus when no trailer is connected it remains silent.
If a trailer is connected and the audible monitor does not buzz when the flashers operate, this warns the driver that his trailer flashers are not working properly.
The reasons for the overwhelming popularity of this audible monitor amongst towbar fitters are its simplicity, its reliability, its relative cheapness and its ease of fitting.
Refer to the General Instructions and Chart A in the section 12N Wiring before following these instructions.
Socket
Pin No.		 7-core cable
colour		  to  Relay wire
colour or
terminal No.		 Relay wire
colour or
terminal No.		  to  Vehicle Circuit
1 Yellow to Yellow Yellow/White to LH Flasher
2 Blue to Direct Direct * to Fog Lamp
3 White to Chassis White to Chassis earth
4 Green to Green Green/White to RH Flasher
5 Brown to Direct Direct * to RH tail light
6 Red to Direct Direct * to Brake Lights
7 Black to Direct Direct * to LH tail light
- - - - N/A to Power (battery)
* Unless fitting a fog cut-out or bypass relay.
     TF1152 Superbuzzer2  Audible Monitor

Buzzer does not sound		    
      Check all connections.
  Check trailer (test board) flashers are working.
  Check your test board is drawing enough current (21watts) to make the buzzer work properly. LED testers do not draw significant current.
Buzzer is not loud enough
  Check it has not been trapped or covered.
  Move it to a better place.
  Fix it to a surface that resonates.
  Replace it with a TF115FL and use the extension wire to put the mini-buzzer where it can be heard.