Since terminals 85 and 86 are the two legs of the relay coil and the diode has to be fitted across same and reverse biased to normal operation in order to quench the back emf from the collapsing magnetic field of same, you need not worry in this respect since I'm not aware of any positive earth diode relays.
Terminal 86 will be the positive supply BTW.
Last edited by RichardV6; 08/03/21 07:40 PM.
