Alt not charging

[indoplasm]

Hi I've got a 93 10th anniversary edition and I have been having problems keeping a charge on my battery. I have replaced both the alternator and the battery and nothing seems to work everytime i go to Autozone to test the alt or battery they test bad in the car but in the store they test good. Any ideas on how I can fix this?

[deevergote]

How are your battery cables? Are the connections clean?

[accordztech]

Check the power to see if you are getting output from the alternator. THen check all the fuses in the fuse box. Check whats the battery voltage at idle as well.

[According2Me610]

Check your grounds . Also make sure your battery cables are on tight . Also might wana check if any lights stay on could be also draing the battery . Also did you tighten your alt when you changed it ?,

[indoplasm]

Yea when I replaced the battery I cleaned all of the connections at the battery end, as well as, putting the battery grease you get with batteries on the posts and terminals

[indoplasm]

The voltage when it idles is at about 10.76 volts and drops when I rev it up. I had tightened the alternator bolts that connect to it as well as the tensioner

[oyajicool]

Try following the steps to make sure the alternator is OK.

[accordztech]

Output is definitely low. It can be either a bad alternator, or a bad sense wire going to the alternator. Do exactly what the test shows on the previous post. It will narrow you down.

[JDMDriver]

You may have repalced with a faulty replacement unit.

I suggest to get your alternator checked by a proper electrician.

I had this same problem, checked double checked traced grounds, changed alternator etc to no avail. A proper electrician spotted my new alternator was still faulty. Third time lucky it was fixed.

[deevergote]

That's a definite possibility. A lot of people are hesitant to suspect a newly replaced part, but it's not uncommon for them to be faulty right out of the box. Especially if the replacement part was a refurbished unit.
My friend and I installed 3 different starters on his car before we found one that worked! (also from Autozone)

[cloudasc]

I have had to replace my alternator before, and the first replacement started overcharging about a week into use or 500 miles later. Changed it out with one not supplied by auto-zone, and have not have an issue since.

[My300kCoupe]

Do you have a battery light on? That a dead giveaway its an alternate issue. i usually see around 14.4 or so at idle. I've had a 3 Month old autozone altornator spike to over 100v randomly on my fluke meter before.

[indoplasm]

I have learned that the alternator is charging but I have a parasitic drain somewhere in the line because when I put the battery on the charger with it still attached to everything and test it with my multimeter it drops charge at about .01 volts/30 seconds or so. I have checked the positive going from the battery to the fuse box and there doesn't seem to be any exposed wire. So what should I try next?

[Accord problems]

and if it is the alternator.

[cloudasc]

If you have a drain somewhere, you should use you multi-meter to check current draw and start pulling fuses one by one to isolate which circuit it is.