Stops running or wont start - 2002 Chevrolet S-10

Head gaskets blown or cracked head. It only takes 1 time of running hot to cause damage as the heads are aluminum and the blocks is iron.

SOUND LIKE ALTERNATOR NOT CHARGING BATTERY.CHECK BATTERY VOLTAGE SHOULD BE 12.6 VOLTS.MAY SURE BATTERY CABLES CLEAN AND TIGHT.WITH ENGINE RUNNING CHECK ALTERNATOR OUT PUT AT BATTERY.SHOULD BE 13.5 - 14.5 VOLTS WITH ENGINE RUNNING.IF ALTERNATOR FUSE GOOD AND ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES OKAY NOT DAMAGED.DRIVE BELT NOT SLIPPING OR BELT TENSIONER NOT DAMAGED.ALTERNATOR MORE LIKELY FAULTY.TURN OFF RADIO FIRST.BEFORE REMOVING NEGATIVE BATTERY CABLE TO KEEP FROM LOSING RADIO CODE.

check your ignition coil....

the alternator may of went bad and stopped charging so the car died when the battery went dead. Charge the battery and test to start with. Are you saying wont turn over ot turns over and wont start. If it turns over and wont start then it could be several things. Will need to get it diagnosed to be sure

When you tur the key forward do you hear the fuel pump running? You should hear a low hum for about 20 seconds near the gas tank and then it stops. If you hear this your pump is good. If it keeps running or you can't hear it at all it's bad or the main fuel pump fuse is blown.

Try Crank Position Sensor it is a known issue with the ML's. They breakdown and are very easily affected by heat.

Put a fuel pressure guage on the test port on fuel rail. With fuel injected engines if pressure is too high or low car wont start.
Cycle key off to run (not start) you should hear the pump run a few seconds and stop.

Wont turn over are you sure as wont start is differant than wont run
Wont start could be Battery/starter/or engine siezed.
Wont run is not the same,,, that could be lacking power /low on oil/water/ Fuel/or even engine lacking power like down on compression which is all the above plus more ....
So check it out let us know again. Ron

I would start with the Fuel Pump Relay. Check the Fuel Pump, Fuel Filter and Belt Tension.