How to test to see if you have a bad battery or bad alternator

Asked by Jun 29, 2015 at 11:11 PM about the 1997 Ford Crown Victoria 4 Dr LX Sedan

Question type: General

I started the car disconnected the battery
the car shut off within 20 seconds I believe
its the alternator I've taken the battery down
to the local auto parts store and they tested
it and they said It was good and within
range. But the battery was to low to run test
On the alternator so I have the battery On a
charger

2 Answers

94,965

First of all never ever disconnect a battery cable with the engine running, you can cause a voltage surge that can fry electronics. I had a customer that did that to his crown Vic and it wound up costing him 1500 bucks to get it running again. The proper way is to have a shop check the system on these high output charging systems, most of them are now computer controlled, so even thought the alternator checks good out of the vehicle it still may not work when in the car. You can check the battery the old school way by making sure it is fully charged, then just turn on the headlights with out the engine running for 20 minutes, if will crank over the engine the battery is strong enough to run your vehicle, if it don't crank it replace the battery. Or your local parts store can run a load test on it to see if it can handle full load or not. HTH

1 of 1 people found this helpful.

Thank u will try that . I'm charging the batter now

Your Answer

Add photo

Related Questions

Search Ford Crown Victoria Questions

Ford Crown Victoria Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 1,790
#2 Tom Demyan
Tom Demyan
Reputation 1,000
#3 tennisshoes
tennisshoes
Reputation 700
View All

Related Models For Sale

Used Mercury Grand Marquis
30 Great Deals out of 1,835 listings starting at $2,000
Used Lincoln Town Car
36 Great Deals out of 1,791 listings starting at $1,500
Used Ford Mustang
537 Great Deals out of 45,845 listings starting at $1,999
Used Ford Taurus
270 Great Deals out of 20,574 listings starting at $1,995
Used Chevrolet Impala
592 Great Deals out of 34,064 listings starting at $899
Used Ford Explorer
928 Great Deals out of 70,256 listings starting at $997
Used Ford F-150
2,059 Great Deals out of 207,350 listings starting at $1,499
Used Chevrolet Tahoe
557 Great Deals out of 31,373 listings starting at $1,500
Used Chevrolet Caprice
151 listings starting at $10,900
Used Chevrolet Camaro
245 Great Deals out of 31,195 listings starting at $369
Used Honda Accord
947 Great Deals out of 77,741 listings starting at $899

Used Cars For Sale

2011 Ford Crown Victoria For Sale
6 Great Deals out of 166 listings starting at $5,950
2008 Ford Crown Victoria For Sale
136 listings starting at $2,999
2007 Ford Crown Victoria For Sale
3 Great Deals out of 111 listings starting at $3,471

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.