where are the ground wires located on a 1997 Nissan Quest ?

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I have a problem with the alarm system being activated with all the doors locked and when I try to open either the passenger or drivers side door the alarm will go off. I manage to disarm the alarm and able to start the vehicle again. This process is repeated over and over again, so i give up and noticed after a couple of days the battery will go dead .The battery is brand new and I even used another brand new battery and they both go dead. I also have a problem with luke warm heat coming in from the front of the inside cab and the rear cab fan does not work neither will the radiator fan after running the vehicle to full operating temp. I have flushed the radiator, replaced the thermostat, the thermal sending unit,the thermal sending switch,and antifreeze. I have also replaced the thermal resistor located by the front heater core.after running the engine for a period of time ( for about 45 minutes ) there is so much pressure left in the radiator after being cooled for over an hour. Even when I try to release the cap, also after running it this amount of time the radiator cap is always cool.