What’s this for and where can I get a new one ??

[vipergts]

under the passenger seat on my 280. Buzzing like bonkers intermittently and brake warning light on and charging light too. Sometimes runs rough too.

 

[MaximG]

Seat belt warning system?

 

[SeanDezart]

Superfluous weight - ditch it !

 

[vipergts]

Not seat belt.

Can’t chuck it as warning lights on

 

[jonbills]

I think it is the seatbelt interlock system relay.
https://www.classiczcars.com/forums/topic/35484-brake-warning-light-relay-bad/

 

[MaximG]

Guess I'm right then

 

[jonbills]

Guess I'm right then

Yes, in my head, I even said you were right

 

[vipergts]

I think it is the seatbelt interlock system relay.
https://www.classiczcars.com/forums/topic/35484-brake-warning-light-relay-bad/

Brake warning light relay. Not that technically minded but I think it’s saying something about fuel pump too

Wonder if this part is available