I am using a standard auto relay 85,86,87a,30,87 which is swithing on a smaller pcb latching relay. I know the reistance in the auto relay is about 70 ohms. The resistance in the pcb coil is about 400 ohms. The smaller relay is being switched on again by back feed through these bigger relays. They are not being affected by this. Just the smaller relays. Is their something I can do to make these more resistant to this backfeed?