Question about 1999 Mercury Sable
Something is draining the battery. That means there is an "open" circuit somewhere. Since you say it happens when you turn your blinkers on, I would say that is where to start. I am used to working on older cars so don't know what related sensors there may be on your vehicle. I usually start with the fuses and/or flasher can. The flasher can would probably be making a clicking sound if it was bad, but like I said, I don't know your vehicle. The fuses are usually located underneath the dash on the driver's side in a small box.
Also check for a bare or cracked wire which may be shorting out against metal. Problem: most cars now have the wires all covered up so you can't access them without taking apart the panel underneath the steering wheel. Or taking apart the steering column.
If you can't find a "shorting" fuse or wire, you will have to have it tested to find where the problem is.
Posted on Nov 06, 2010
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