Bosch does make a relay with two independent '87' terminals. Terminal 30 is battery feed, terminal 86 is input from the thermostat switch and 85 is a ground for the relay coil. I haven't loaded my John Deere pars info on this computer so I can't give you a Deere P/N.
Do not get the relay with a 87a terminal--it feeds battery voltage to the 87a terminal when the relay coil is NOT energized. This relay (with the 87a) is a SPDT.
