Question about Cars & Trucks

1 Answer

My 77 coupe deville keeps draining the battery.i

My 77 coupe deville keeps draining the battery.i got new battery I got new battery post .i did not change the alternator because when I take the - cable of the battery my car stays on..can someone please help

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 21,873 Answers

To begin with, please don't ever disconnect the battery cable with the engine running. You can cook the alternator and the computer.
Have you pulled the fuses and disconnected everything to check for a drain ?

Posted on Apr 30, 2013

  • 1 more comment 
  • Frank rosado May 01, 2013

    No I have not taken any fuses out..nd I won't do that again.i just thought that was one way to see if the alternator worked.but I won't do it again..could it be the battery is a valuecraft from auto my 3rd battery.

  •  Stephen
    Stephen May 02, 2013

    I would have the battery and alternator tested on the car. If both check out ok, you will have to pull the fuses and disconnect the major circuits to find the drain.

  • Frank rosado May 03, 2013

    It was a fuse......thank you so much u guys ....



3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

GM Elec
  • 1000 Answers

SOURCE: Battery and Alternator Good. Alternator not working. HELP!!!

djn, I believe you have some accessory that is on when the key is in the off position.
Check to make certain glove box light is not on when the glove box door is closed and the trunk light is not on.
If you have an aftermarket radio or any added accessories make sure they are not wired direct to battery voltage.
If all that checks out, disconnect the battery negative and connect a test light between the battery and battery cable. If the light is on you have a drain in the electrical system. Leave the light connected and begin removing 1 fuse at a time until the light goes out, that will tell you what component or circuit is draining the battery.
Last resort, you may have an alternator drawing the battery down.
Good luck and let me know.

Posted on Mar 01, 2009

SOURCE: My car battery keeps getting

You need to put an AMP Meter in series with either battery cable, and then look for a circuit not timing out,after you remove the key.
May take 20 minutes.
Anything over 40 Milli-Amps is too much
Start pulling fuses one at a time, to find circuit, then you need a wiring schematic of complete vehicle to find problem.

I always purchase shop manuals and wire diagrams, as soon as I buy a new vehicle. Will need owners manual -for fuses.

Posted on Sep 29, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Battery draining

That test light method is not a true indication of what the issue is. You need to use an amp meter in the same manner but it has to be able to read at least 10 amps. Keep in mind that if you have the door open on the car that it draws a lot of current.

Aug 09, 2015 | 2004 Cadillac Deville

1 Answer

Draining the volts form my battery. Not sure what is causing this? I keep charging the batt. but when driven short distances, Battery not charging light keeps coming on ?

Hi, if the battery charging light keeps coming on and the battery is draining it almost certainly means that your alternator needs attention. It may be that the alternator belt is loose or is slipping or theremay be a fault with the alternator itself. A local garage should be able to help you rectify the issue quickly
Good Luck

May 27, 2015 | 1989 Cadillac Sedan DeVille

1 Answer

1991 cadillac deville drains battery overnight. Battery is good, has a 4000w amp hooked up for subs, but also a marine yellow top battery in the trunk to act as a powercap, so its not overloading the...

when you have a problem such as this, i would try to unplug the amp over night and see if any thing changed. also you can take a 12 volt test light and remove positive battery lead. then hook up the test light in series ( the wire end with clip hook to cable that's off . and the pointed end for checking curcuits. goes to battery post. the post you removed cable from .the test light will will be bright if you have a large drain on this should have a small drain for the memory for the ecm in the car. then start removing fuses until the test light goes out or dim.try to leave the amp unplugged during this test. maybe this will help!!

Sep 21, 2011 | 1991 Cadillac DeVille

1 Answer

1980 caddy coupe deville has brand new battery, brand new alternator but the battery keeps draining.

Something is staying on after the key is turned off. easy way to find out what is staying energized is pull all fuses, disconect the battery, then put the amp meter in line with the positive side of the system between the positive battery post and the positive cable end. then put the fuses back in one at a time a see which one draws one or two amps. that will lead you to the draw down circuit. If nothing is pulling the battery down then the battery is not getting a full charge. Check the ground conection at the motor side of the cable and also the ground strap between the motor and the firewall

Apr 18, 2011 | 1980 Cadillac Deville

1 Answer

My 1994 cadillac deville is draining the battery and the headlight warning bell keeps dinging while im driving and the doors are all closed

Have your alternator checked at an auto parts store. It sounds like it isn't keeping up with the drain on yuor battery.

Nov 20, 2010 | 1994 Cadillac DeVille

1 Answer

Check charging system

So you have a new alternator. I S IT CHARGING ? If the answer is yes , and the battery still dies, I would say there is a 12 volt drain in the electrical system. Hope this helps

May 21, 2009 | 1991 Cadillac DeVille

2 Answers

95 concours battery keeps draining out


Apr 10, 2009 | 1995 Cadillac DeVille

2 Answers

Battery keeps dying in the middle of the night

have the alternator checked it could test good and still be bad but it can also drain the battery 9 times out of 10 its the alternator thats draining the battery

Feb 01, 2009 | 1998 Cadillac DeVille

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

82 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

77169 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides