2002 Pontiac Grand Prix GTP, 3.8 supercharged...battery is being drained, charge it fully one day and cannot turn car over to start next day. Brand new battery which has been checked and is fine.

5

Asked by Aug 10, 2011 at 11:53 AM about the 2002 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

Asking for any help, suggestions.  Something is draining battery overnight.  We have checked cooling fan motors, suspecting might be alternator.  Is there a way to test and what parts should we be testing?  Any help would be greatly appreciated.

5 Answers

135

yeah take to technician and have a voltage test done. It may be a dirty ground or power wire coming from battery or alternator.

2 of 2 people found this helpful.
10

what if you have changed the battery and still getting the ?

10

do you have a sound system in the car?

1 of 1 people found this helpful.
705

with the key on, engine off, use a digital mutimeter with the leads in the fused ports on the meter to test amp draw across the main fuse. may be labeled as the solenoid fuse. positive lead on the battery side, negative lead on the electrical system side. write down the result, then put the fuse back in and turn test the amperage output of your charging system at the wire leading from your rectifier (the box that your alternator runs to) with the negative lead to ground. if the result of your charging test is lower than your draw test, there may either be an issue with your alternator, your voltage regulator, or possibly you may just have too many accessories running at one time. i had this issue, and ended up buying a high output alternator to pick up the draw that my audio system was creating. if there is no issue with the charging system, you likely have an unwanted ground somewhere in your electrical system.

635

Well Bernard has the tech solution there. If you cannot locate the problem and don't want to spend a small fortune on diagnostics, you might try installing a battery cutoff switch. These are inexpensive and can be mounted on the outside so you don't even have to open the hood to turn it on.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,757 nationwide Grand Prix listings starting at $1,200.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 4,370
#2 Tom Demyan
Tom Demyan
Reputation 2,970
#3 munron
munron
Reputation 2,350
View All

Related Models For Sale

Used Chevrolet Impala
574 Great Deals out of 34,604 listings starting at $695
Used Pontiac Bonneville
3 Great Deals out of 524 listings starting at $1,799
Used Chevrolet Monte Carlo
14 Great Deals out of 1,333 listings starting at $995
Used Pontiac Grand Am
1,069 listings starting at $1,599
Used Ford Mustang
735 Great Deals out of 42,661 listings starting at $1,300
Used Chevrolet Camaro
411 Great Deals out of 31,557 listings starting at $2,395
Used Chevrolet Malibu
1,178 Great Deals out of 77,666 listings starting at $1,500
Used Pontiac Firebird
11 Great Deals out of 811 listings starting at $1,900
Used Honda Accord
971 Great Deals out of 62,362 listings starting at $999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.