You can go to any wrecking yard and find hundreds of Bosch SPDT relays in European cars (I prefer the Bosch type because most will have the circuit diagram printed on the case), or you can pay $3. ...

It has 2 terminals and 4 connectors and you can look at the DPDT relay as the equivalent of 2 Single Pole Double Throw SPDT relays. DPDT relay applications 1. Change motor direction with DPDT relay As ...