0
Pull the hot battery cable off of the battery if the alternator is bad the engine will stall out.
12/07 If you have the unit out, run it down to your local parts dealer (probably shouldn't say their name) and they can bench test it for you. Most of these places will do it for free in hopes of selling you a new one. If you have the older-style (pre-electronic) system, it's as easy as having the car idling, connecting a voltmeter to the battery, then (here's the scary part) connect the large post on the alternator's back to the small post. It's best to do this with a medium gauge, insulated test jumper. This, in effect, forces the alternator to put out to its maximum. Do NOT rev the engine at all, unless you're due to replace every light in the car that happens to be on during the test. Assuming all your connections are clean and tight, you should expect the voltmeter to display at least 14.5 volts. Keep in mind that a battery that's anything but fully charged will skew your readings, but you can still compare the before and after numbers while connecting the jumper.
Wiki User
∙ 16y ago
Add your answer:
Earn +20 pts
How do you test your alternator to see if it is good?
take it to autozone and they will check it for free.
Is there a way to test yeast and see if its still good?
is there a test to see if yeast is still good
Why does the Crown Victoria 15 amp fuse pop when I put it into drive?
it happened on mine my guess is your alternator internal parts are dirty or the berring in the alternator is bad, these will still past alternator test try replacing it and see if the problem persist
Alternator not charging battery 1998 Tahoe?
if its not charging make sure all your connection are plugged, simple way too test your alt. is start the car remove the pos+ive terminal and see if it still runs if not bad alt. and you will need it replaced. This procedure is not recommended. It can damage a good alternator.
Why is the battery light staying on in your 1991 Toyota 4-runner?
There is something wrong with the charging system. Check the alternator and the battery to see if both are still good. Good Luck!
My battery will not hold a charge with a new alternator?
Here is a test u can do to see if Ur alternator is good or not . when car is running disconnect the negative battery terminal it's the black wire.If car stalls then the alternator is bad if it doesn't stall then it's Ur battery is bad and u have to replace it
How do you test a John Deere alternator to see if it is putting out a charge while still mounted?
Your 12 volt battery should be about 12.5 volts without the engine running. Test and verify it is. Now with the engine running test again, Voltage should now be around 13 to 14 volts. If not, then your battery or alternator are bad. To check a battery try charging it with a battery charger.
Can a car battery be tested?
Yes- a load test can check to see if the battery has failed, or is just discharged. Soemtimes the battery is still good, but the charging system (alternator, drive belts, cables, voltage regulator) may be bad. Most shops, and many auto parts stores have a load test meter and will check the battery free for you.
1986 ford escort not charging you have replaced the alternator and still wont charge?
you need to do a voltage test and see if there's a greater load of energy returnig to the battery and compare it to the load leaving. if your return is greater then the problem most likely will be your battery.if there is no or low voltage returning from the alternator check your wiring and or consider another alternator change. another test. turn on your car , while the engine is runing disconect your battery positive first then negative. this test while not accurate it will most likely tell you if the alternator is working.(the car should stay on)
Why is your new alternator not charging your new battey on your 1998 Mazda 626?
It may be a bad new alternator or it was not connected properly. Have the alternator tested to see if it is actually good.
What does it mean when the volt light stays lit on a 1994 Chevy Lumna?
Most likely your alternator is failing or has failed. Try to get tbe vehicle to an auto parts retailer and see if they'll test the alternator for you. The test is usually free.
You are told that your 2001 Sienna with less than 30 thousand miles needs a new alternator Is this usual?
Manufacturer defect maybe... go to a reliable shop and have them bench test the alternator...if not working have them replace it... ask to see results of bench test.
