wiring two SPDT relays to operate a 12v DC motor Forwards and Back
I will translate your automotive relay nomenclature into our electronic nomenclature:


85 and 86 are coils
87 is N.O. (normally open)
87a is N.C. (normally closed)
30 is COM (common)


2nd diagram:







simulate this circuit &ndash; Schematic created using CircuitLab