My voltage is around 12 volts.

[johnpatrick]

I replaced the alternator in my 99 mountaineer. I checked the voltage from the alternator it's 12 plus. It's starts right up the light is still on and it dies after about 10 minutes of driving.

 

[n2epv]

Welcome to the forum! The battery voltage should be somewhere around 13.5 volts with the alternator charging at summer temperatures. A voltage of a little over 12 sounds as if it isn't charging. Most auto parts stores will do a free battery/alternator test, in hopes of selling you something.

Hope this helps.
Dave

 

[BrooklynBay]

Welcome to this forum! I've renamed, and moved your thread to the stock 95-01 section. I agree that it sounds like your alternator is not charging.

 

[chance942]

Battery isn't charging or holding. My daily temps are 95+ and I'll get a charging reading of 14 or higher.

 

[johnpatrick]

It's a new alternator is it possible that it is bad?

 

[corkey]

hey, even if the batteryu was bad it should still run on the alternator for a bit, or until you want to increase the rpm above idle,

check all the connections to the battery , than get both tested, autozone will test both for you , like was said , in hope of selling you something,,,

 

[chance942]

It does run on the ALT for a bit. Corkey is right too,check your connections,ALL of them.

You said you checked your charging voltage @ 12 or so, so I assume you have a meter. Let it run a bit,disconnect everything on the batt and measure your volt drop after 30 minutes.