Seat belt relay, proper hookup

[lhoboy]

I would appreciate someone giving me the wire colors going to each of the three spade connectors on the mid-70s FJ40 seatbelt warning relay. (Passenger side footwell on the firewall)

Thanks.

 

[Coolerman]

Blue/Red on top. This is the +12V input and goes to Fuse 5 Heater
Black/Yellow on left. This is the switched + wire and goes to the two pin connector for the seat belt buzzer to supply it with power.
White/Black on right. This is the ground wire for the relay coil.

When the key is on this relay is on. If the seat belt is NOT plugged into the seat belt latch housing, the switch inside the seat belt latch housing is CLOSED and connects the buzzer to ground causing it to buzz. When you insert the seat belt latch the switch is opened and the buzzer stops.