Other Bypass Relays etc.

1-way, changeover relay and 3-way and 4-way bypass relays employ miniature relays to switch trailer lamps on and off. Connection is made to the vehicle’s lamp circuits but only for the purpose of energising the coils of the relays. The current drawn by each relay is less than 40 milliamps (0.04amps). This current is so small that it cannot be detected by bulb failure sensors in most vehicles. These simple relays have been largely superseded by more sophisticated bypass relays with much lower current draws.
Also shown here are the fog-cut-out relay and the reverse (parking) sensor cut out relay.

Fog Cut Out Relay

Fog Cut Out relay

This relay fits in line in the vehicle's rear fog light circuit and switches off the vehicle fog light(s) when a trailer is connected.

Ref No: TFC2

Unit Sale: each

Retail: £11.68 + VATAdd To Cart

Reverse Sensor Cut-Out Relay

Parking distance sensor cut-out relay

Fits in line in the rear parking distance sensor circuit and switches off the sensor buzzer when a trailer is connected. It is not usually suitable for vehicles with factory-fitted parking sensors (Typically, these have the buzzer under the dash)

Ref No: TFR1

Unit Sale: each

Retail: £11.50 + VATAdd To Cart

Bulb Failure Bypass

Single bypass/ change over relay

A single relay for a single circuit with normally open and normally closed outputs - can be used both to switch on and to switch off. Coil current only 38mA.

Ref No: TF1011X

Unit Sale: each

Retail: £12.00 + VATAdd To Cart

Three-way bulb failure bypass

A small double relay for switching two or three circuits, such as trailer lights. It takes less than 40 milliamps from each vehicle light circuit to switch. Power to supply the trailer lights is drawn from the vehicle battery or fusebox.

Ref No: TF1013

Unit Sale: each

Retail: £7.18 + VATAdd To Cart

Four-way bulb failure bypass

A small triple relay for switching three or four circuits, such as trailer lights. It takes less than 40 milliamps from each vehicle light circuit to switch. Power to supply the trailer lights is drawn from the vehicle battery or fusebox.

Ref No: TF1014

Unit Sale: each

Retail: £8.15 + VATAdd To Cart