Relay Guide | Essential Towbar Electrics Fitting Checklist

How many Trailer Sockets? How long should the cable be?
  How long should the cable be? (e.g. most fitters prefer 2m.)

Other common lengths: 3m, 5m.
1.6m  2.0m
Will you fit
Single Socket plated
                          unplated, with seal

Single 12S unplated       

Double socket

 TF120
TF120UP
        
TF121UP

TF122 

TF120A
TF120AUP
        
TF121AUP

TF122A

13-pin sockets

TF1313PW
Which Flasher Monitor or bypass relay?
You can monitor the flashers only
or
you can fit bypass relays on one, three, four
or
all seven trailer circuits 
A standard rear audible monitor or one with bypass ability on the flashers TF1152

TF110R*

A one, three or four-way bypass

See Bypass Relays

One with bypass ability  on ALL the road lamps (inc. flashers)

TF2218/7
TF2218/7PIN
Will you fit a Caravan Relay?
To switch the  fridge
and battery 

A Smart Combination relay ? 

TF1170-3
TF1170-4
An altenator-switched Combination relay ? Pin type TF116
An altenator-switched Combination relay ? Screw Type TF1171