2009 Mercury Mountaineer Premier 2wd Battery would not hold a charge even off the vehicle max would be 10.2 after drain down. Replaced battery had vehicle checked with alternator comp, said voltage re

It depends if the Remote starter is Ford installed or aftermarket.

How To Reset Your Remote Car Starter

The Drive https://www.thedrive.com > cars-101 > how-do-i-reset...
Jul 22, 2020 - Here's exactly how to reset your remote car starter or key fob ... Press the Lock button on your remote car starter. Within five seconds of ...

Missing: Mercury ‎Milan ‎Premier.

When I try to open the door with the button on the key, it

JustAnswer https://www.justanswer.com > Mercury Repair
Mar 9, 2021 - 3. Turn the ignition OFF. The system will chime to confirm programming mode. 4. Within 10 seconds, press and hold any button on first keyless ...

1 answer · Top answer: It will either be the battery in the key fob or a faulty transmitter in the key fob or the ...

Factory Remote starter not working any ideas?

FordFusionClub.com https://www.fordfusionclub.com > threads > factory-re...
May 5, 2009 - And to enter/exit valet mode, you turn the key on/off 3 times, starting and stopping in the off position, not starting the car. In other words, ...

Small button/switch on the wiring? and LED on the steering ...
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Things you might not know about the Ford Fusion / Mercury ...
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give your local mechanic a call sounds like you alt. has died

Do a parasitic battery drain test to find what's draining the battery

http://ricksfreeautorepairadvice.com/battery-dead-morning/

If the vehicle was dead and then required the jump, make sure it runs for about 15 minutes. This ensures the alternator has ample time to recharge the battery. If after this time frame the vehicle won't start again, then either the battery isn't holding a charge, or the alternator isn't charging the battery like it's suppose to. More than likely it's the battery that is the issue. Make sure the connections to the battery are cleaned before making this diagnosis.

It sounds like there must be something draining the battery while the vehicle is switched off. It could be something like a trunk light which is not switching off or a short across some circuit that does not show up on any light. The first and easiest test is to disconnect the battery negative cable whenever you park the vehicle overnight etc. and see if the battery still runs down.
As a more positive step and if this does not affect the alarm, disconnect the positive lead from the battery and wire a bulb like a tail light bulb, between the terminal and the removed lead. The bulb should light up. Make sure that everything on the vehicle is switched off, the bulb should still be lit. Remove and replace the fuses one by one until the bulb goes out. That is the circuit that is running your battery flat. Check all the components on that circuit until you get the light to stay out and your problem should be fixed.
Check your charging system. With the engine running at about 2000 rpm, a volt meter across the battery terminals should read around 14 to 14.5 volts and drop to about 13.8 volts with the engine at idle. If this does not happen, the charging system may be defective. Even with lights on the voltage should climb, but will drop lower at idle.

There are many possibilities for no start problem in vehicle.May be the new battery is low on charge or its not connected properly.Or the battery is fine but something else is causing the problem.Click the link to check other possibilities causing no start problem in car:--- http://technoanswers.blogspot.com/2011/06/1997-mercury-mountaineer-wont-start.html ------------ This should help.Thanks.Helpmech.

Are you sure the alternator was bad? Could be a bad cell in the battery. Was battery charged after alternator install?

Have the battery tested, perhaps the alternator also. I had the same problem on my 2005 Taurus ( also a Ford / Mercury product ). I replaced the alternator easy enough, and a full charge on the battery solved the problem. The vehicles are designed to shut down unnecessary or non-vital accessories first, as to prevent a major shutdown on the road. So your lights and signals will still work, but the rest of the electrical will power down to conserve the battery.

You can get the battery tested at most service stations or you can buy a tester at any auto parts store. Some of them will test it for free.

Hope this helps.

Have the alternator tested, perhaps the battery as well. Otherwise, there may be an electrical drain somewhere and that would have to be looked at by someone who knows about vehicle electrical systems. Try the battery and alternator first....