Step by step on how to replace the alternator on a mercury sable 3.0L?

Replace the alternator. It's shot.

You have to discon the battery cable before you start. Remove the coolant expansion tank. Remove the drivebelt and alternator if you have an OHV V6. Raise the vehicle on jack stands. Place a drain pan below the pump. From below, remove the splash shield and discon any brackets or ties that hold the hose to the body. After draining, you may have to replace the pwr steering fluid filter, located in the fluid line, then replace the fluid. A crows-foot wrench may be necessary to remove some hose fittings. This is a job for a mechanic with a power lift to be honest. Whatever you do, be careful not to contaminate the power steering fluid. Bleed the system after replacing the hose. The pressure hose is held in place by threads and not a clamp as the other hose has. Get yourself the Haynes repair manual 36075 '96 thru 2005 Ford Taurus & Merc Sable. It has a detailed step by step description of this procedure. Good Luck

Try test the Mega alternator/ battery fuse, should have power across both circuits.

Check for power on both sides of the mega fuse located fuse block in front of engine along the side.

The VR is integral to the alternator. Check the fusible link and the 10 amp fuse in the battery fuse box.

May have blown the fuse or connections to alternator may be poor.

Faulty bearing on alternator.

quick charge battery on high for 3 mins check with volt meter if over 15volts shorted across 2 cells

Hi,sound like a bad (tps , trotle position sensor, Good Luck

Pray