Dead battery after car sits more than 8 hours

Asked by Nov 07, 2016 at 03:57 PM about the 2000 Cadillac DeVille Base

Question type: Maintenance & Repair

Replaced Alternator, Battery and Alternator grounding cable. After new items were installed, took car to Auto Zone and re-tested Alternator and Battery, both tested well. The voltage while car is running stays at 14.4 volts. Checked at night to see if any lights or electrical items are running, nothing noticed. Re-checked the grounding cables for the battery and Alternator, nothing abnormal.
Is it possible even though the alternator checks out that it isn't the correct one for this year car.
Note: The Alternator was a cheap replacement that I found at Rock Auto: PURE ENERGY 15476 Remanufactured; Reman; 140 amp $104.99

3 Answers

4,565

Doubtful if it is the alternator since you are reading 14.4V when running. More likely it is something hard to see that is draining your battery when at rest. It is not necessarily a light, just an electrical module that is incorrectly working or shorted to ground. The best way to find it is to hook up an Amp meter between the hot pst of the battery and the end of the positive battery cable (after removing the cable from the battery). You should see a small but positive current flow on the meter. Then have someone pull each fuse from the fuse panel until it shuts off, This will tell you what circuit to investigate. Then you need to begin examining the wires and devices on that circuit to find the defective part. Good luck.

Thank you Taver91, that gives me a starting place. Will update if I fine anything out.

Update, It was a bad car battery (even though it was brand new) crazy readings on the voltmeter, pulled every fuse at least twice. With the new battery, all is back to normal.

Your Answer

Add photo

Related Questions

  • 2001 cadillac deville battery just stop working correctly 3 answers

    Well to start, my car crunk and it started seeing on the dash that my battery was not charging so after a couple hours it just went out and it is just dead now and all the lights are out on it i rea...

    2001 Cadillac DeVille

    -

    Maintenance & Repair

  • Car Won't Turn Over 1 answer

    I just recently bought a 1997 Cadillac DeVille and it has 147,XXX miles on it. When I first got it, it started good and ran good. Now it won't start and just makes a ticking noise. I charged the bat...

    1997 Cadillac DeVille D'elegance Sedan

    -

    Maintenance & Repair

  • How do I disengage the traction control system. is it connected to the rear brakes?. 2 answers

    My car a 2005 cadillac deville with 228,000 plus miles has been well maintained and services as indicated by the manufacturer. the traction control system is now engaging as soon as i start the car. ...

    Cadillac DeVille

    -

    Maintenance & Repair

  • I have a '91 Sedan Deville that gets poor mileage (14) and has sluggish acceleration 7 answers

    I have had the car for 7 years and for the first 4 it was fine . It started losing power and would die at idle and then sometimes be difficult to start. Mileage went down to 14 from about 22. I have...

    1991 Cadillac DeVille Base Sedan

    -

    Maintenance & Repair

  • Starting up my car 2 answers

    I left my key ignition switch on for about 30 minutes car needed a boost got it started drove it for about am hour turn car of now it won't start back up

    2003 Cadillac DeVille Base

    -

    General

DeVille

Looking for a Used DeVille in your area?

CarGurus has 1,620 nationwide DeVille listings starting at $2,200.

ZIP:

Search Cadillac DeVille Questions

Cadillac DeVille Experts

#1 kikero
kikero
Reputation 2,100
#2 Js08016
Js08016
Reputation 1,740
#3 Cynthiasmith
Cynthiasmith
Reputation 1,530
View All

Related Models For Sale

Used Cadillac Eldorado
341 listings starting at $2,900
Used Lincoln Town Car
32 Great Deals out of 1,839 listings starting at $600
Used Chevrolet Impala
532 Great Deals out of 29,799 listings starting at $799
Used Cadillac Escalade
241 Great Deals out of 10,966 listings starting at $3,000
Used Chevrolet Camaro
148 Great Deals out of 32,808 listings starting at $1,995
Used BMW 7 Series
189 Great Deals out of 6,078 listings starting at $2,999
Used Chevrolet Corvette
96 Great Deals out of 20,436 listings starting at $3,495
Used Ford Mustang
387 Great Deals out of 47,198 listings starting at $1,999