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Charging system The 2005 Montego that we have is not charging correctly. The battery is new, but the battery keeps going dead. We charged it up and started the car and when I disconnected the battery the car ran for a couple of minutes and then died. I am assuming that it is the alternator, but the system check says that the charging system is okay. I want to save some money, but I may have to take it to the shop. Any suggestions.

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

michigan man
  • 3533 Answers

SOURCE: Check charging system icon keeps coming on

I had the same problem with a 99 sable and it was the drive belt

Posted on Jan 11, 2009

SOURCE: Charging problem.. Wont charge battery

The instructions for installing a new alternator usually read to fully charge the battery (12.3 - 12.8 volt range). Otherwise, the alternator will be damaged when it initializes. I have seen some extreme damage result from installing a new alternator with a low-charge battery. The torque required to turn an alternator when damaged in this scenario is unbelieveable!

Posted on May 02, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: Battery keeps going dead

Hello raiderfan520....Have the battery "load tested" this will tell ya if the battery is defective, one bad cell will draw the others down. If it's bad and only 12 months old you should have warranty left. (free replacement or pro-rated)...If your battery load tests OK, then you have an amperage drain going on while the vehicle is parked.
This is called a "parasitic drain"
Make sure no interior lights, under hood, trunk lights...etc. are remaining on. I hope you don't need the following information i'm about to give you, but here are the steps to locating a parasitic drain.....

  1. Remove the negative side battery cable from the negative battery terminal.
  2. Attach an ammeter(this measures amperage) between the negative cable and the negative battery post. wait a few seconds to several minutes for the car to go into sleep mode. i.e. when you make the contact with the test light the cars computer systems "wake up" after a bit of time they will go to "sleep".
  3. If the ammeter is reading over 25-50 milliamps, something is using too much battery power.
  4. Go to the fuse panel(s) and remove fuses, one at a time. Pull the main fuses (higher amp ratings)last. Be sure to observe the ammeter after pulling each fuse.
  5. Watch for the ammeter to drop to acceptable drain. The fuse that reduces the drain is the draw. Consult the owners' manual or service manual to find what circuits are on that fuse.
  6. Check each device (circuit) on that fuse. Stop each lamp, heater, etc. to find the drain.
  7. Repeat steps 1&2 to test your repair. The ammeter will tell you exact numbers. There you go...everything you never wanted to know... I hope this will fixya up...good luck.

    PS...what kind of season are the raiders going to have this year? I'm in LA county and "Manny being Manny" has turned me away from baseball for now.

Posted on May 14, 2009

  • 131 Answers

SOURCE: 1995 bmw 318is new alternator battery dieing

check all the lighting on the car, IE: trunk light,glove box light, light under the hood, any small light make sure they shut off ,check to see if you have a phone charger left in the cig. lighter, radar detector ETC. any of those things can drain a battery over night quick.if you dont find anything wrong then you may have a short somewhere in the electric system... hope this helps you...

Posted on Jun 14, 2009

  • 1162 Answers

SOURCE: Low voltage, the battery runs low when running the car

What is the voltage you are reading? Is it below 13.2 or so? Also have you checked the current with the engine off to see if something else is working that should not be on. I ran across this twice while working on a truck and car. A relay that was wore out keep trying to close and would drain the battery every couple of months. Sometimes you can hear them clicking or buzzing. Touching them sometimes they are warm or real hot. But that is not a sure sign it is bad. In my Trailblaze they get hot but are ok. Another thougth is the belt on your alt, correctly set to spin it at the right voltage. I have ran across this many times lately with serpatine belts.

Posted on Aug 04, 2009

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