Mahindra (2011)5035 HST TLB & (2016)2555 HST Cab & (2017)1526 HST(2018)Cub Cadet Pro Z 154L (1991) Caterpillar E70B
Whilst I do not have that exact tractor... I bet you will find it in the front by the battery. It is a big black thing about 2" by 3" with big wires coming to/from it to handle the grid heater current. It will not be a little standard size relay, but should be right next to them.... hope this helps......