Brake Light Switch Relay

This is the plugpal classic car brake light switch relay, to enable your classic car’s brake lights to shine as bright as they can and also to protect against poor quality switch components.

Modern components for classic cars can leave a lot to be desired when it comes to quality of construction and longevity of usefulness.  One of these areas is the switches used in the braking systems to illuminate the brake lights when the pedal is pressed.  With the changes in bulb technology, it is entirely feasible that a greater draw of power is being passed through the switches, causing them to fail far earlier than should be expected.

The plugpal classic car brake light switch relay alleviates those issues by taking the high electrical load away from the switch connected to the brake pedal, allowing a relay to do the hard work of passing the current, the switch just being required to pass enough power to activate the relay.  The product is designed to either use the power already being supplied to the switch and divert it to the relay using the supplied Lucas bullet double connector and jumper wire or to take its own 12v supply directly to the relay using the supplied extension lead.  An additional single bullet connector is included to join the wire from the relay into the vehicle loom wire that goes to the brake lights.

Please note this is for a relay solution that is designed to connect to a switch activated directly by the brake pedal such as the Lucas SMB442 or BHA4675 and is fitted with 4.7mm Lucas bullet connectors.  If you require a relay that takes it’s signal from a pressure switch with spade terminals, please consider the plugpal brake light pressure switch relay.

As with all plugpal products, this item is assembled using quality components, the connections being crimped where appropriate, not soldered (due to the risk of stress fracturing of certain connections in environments with large amounts of vibration, such as automotive applications) and waterproofed where appropriate using heatshrink and covers.

Instructions for the two ways of connecting the plugpal brake light switch relay can be found on this page.