Question about 2000 Ford Explorer

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NEED TO KNOW THE OUTPUT OF THE ALT. TO BATTERY

NEED TO CHECK ALT NOT CHARGING{ EVERYTHING IS NEW

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  • Contributor
  • 13 Answers

You should get 13 to 15 volts output .

Posted on Nov 20, 2014

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Posted on Jan 02, 2017

kirkx
  • 2019 Answers

SOURCE: charging system

If you have changed the alternator and regulator, about all that could be left would either be a short circuit that is draining current away, or a bad ignition warning light bulb. That is because the power to energize the field of the alternator, comes through this dash bulb.

Posted on Jul 25, 2009

Lbogie68
  • 158 Answers

SOURCE: 2006 sel awd on third

you definatly have a grounding issue, I would look at all of your wiring underneath especially what is exposed to the elements.

Posted on Mar 24, 2011

pchambley
  • 334 Answers

SOURCE: 03 Taurus, battery light comes on. R&R bad alt &

You may have a a/c voltage leak comming from the alternator..If its a rebuilt alternator sometimes you get a bad one ..But make sure all your connections are good ecspecially the small wires coming out the back ..These are the field and sensor wires..Plus make sure all your grounds on the vehicle are not broken or missing..You can have good voltage but it may have a drop going to the computer because of a ground and cause the light to come on

Posted on Sep 15, 2011

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2 Answers

Does the ECM control the alternator charging amperage/voltage on a 2004 Suzuki aerio? New alternator only charges @12.5. Won't charge enough to keep ahead of necessary power draw.


Some vehicles are fitted with a smart charging system that is designed to prevent the alternator charging during acceleration to free a few horsepower to help.

My experience of these is very limited but there is an ECU that controls them and the battery, charging or ignition light using information from the engine management system.
The alternator generally has an extra plug with about four or five wires which when disconnected render the alternator a standard machine sensed type.

Japanese vehicles used separate voltage regulators longer than most types. You either need experience or a wiring diagram for good fault diagnosis but mostly it is unnecessary to check the charging current of an alternator which bears little significance unless being tested with a graduated load or adjustable carbon pile.

The current output of a healthy alternator is dependent on the terminal voltage of the battery which in turn is dependent on the electrical load placed upon it. Switching on the lights should lower the voltage and increase the alternator output. If the battery is particularly good the voltage won't fall very much and the current won't increase as much as expected...

Measuring the battery voltage with the engine running at about 2000/2500 rpm is sufficient for most purposes. With nothing switched on and a fully charged battery it should be around 14.5 volts and with everything switched on (lights, HRW, heater fan, etc.) a healthy alternator should continue to maintain a voltage above that of a healthy fully charged battery (13.2 volts).

If the voltage isn't maintained on load the charging system, probably the alternator, is faulty and should be independently tested.

Jan 25, 2017 | Suzuki Cars & Trucks

1 Answer

02 Camry charging circuity


great questions...!!!
no it cant, mine can.
most dmm do 20 amps
most cars do 100 to 500 amps. cranked.
the alt can do 50, some more.
yes, its all DC, and the best tool is a DC amp clamp meter for $50
the alt is AC inside, and DC outside, thus the name.
why jnot say context what are you doing.
i need to know your plans.
dead battery ever 5 hours.
car wont start
battery explodes.
wires melt.
what?

testing the ALT on car , takes some skills
alts. can in fact shut down even when 100% OK (it's loansome)

most folks never read the spec on the VR.
its can be very complex this.

cases in point.
open ground or big wire.
battery going open inside. (cracks in battery or a cell dries up)
over volage (over 16v)
battery shorts. or cables shorts.
cable opens or ground opens/
some newer cars the ECU is the VR. ! !!!!
older cars the charge lamp out , nets you no, start up exciton field current (born dead ALT)

to do this we must know what alt we have.
the FSM covers that as does ALLDATA.com

so here are the 1st test.
12.6v at battery means charged (resetted and not freezing)
13.3- 15v running means the ALT is working
i stall engine
and leave head lights on for 2 mins. or so.. battery was discharged.
so i start up with my amp clamp (DC) clamped on to the
ALT big signal wire, it shows me 40amps.
good.
if not bad.
as i watch it ,it can drift to zero (or to 5amps ignition power)
note polarity , - is drain + is charging.
depends on clamp orientation, that is why i use discharge test first.
+40amps?

need more ask.

Dec 27, 2013 | Toyota Camry Cars & Trucks

1 Answer

Hooked up battery backwards on my 1992 ford explorer. Got it running now the alternator isn't charging the battery. Has 12 volts power. Could it be the points on alternator where the wiring hooks into...


The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first

Jul 26, 2013 | Cars & Trucks

3 Answers

No charging condition - tested new alt, tested new batt


OK....Since you've tested ALT & BATTERY?..Then you should inspect that missing fuse for horn and see if maybe it's been put in as a replacement in a port for anything to do with charging system,ie: alt,battery or other?....Then check ANY fuse links on the wiring/battery cables and other like to altenator etc....If you dont know what a fuse link is,most times it's on the hot wire that goes to starters,close to it,and to explain what it is--it's a short length of wire that is smaller,like a filament,like a bus fuse,cept these are coated and you cant se theyre blown,you have to do a continuity test to see if filament type wire isnt broken.....Another thing you may want to try is ADD an additional body ground wire from battery negative post to body of vehicle.I had a 71 Monte Cralo way back and I went through a similar thing and NO electronics thank god! But I added a fresh,thick wire from battery to body heavy bolt type screw and problem was solved....Hope I ahave helped,please post if it did...Thanks JD

May 02, 2017 | Cars & Trucks

1 Answer

Alternator appears to not be charging the battery. No error indications, everything is working but I had a dead battery (which took a charge and is at 12.4 volts on its own). Multimeter does not go up...


Batterys sometimes get sulfated and throw off any charge given them. replacing the battery is the first course I would take. Then check the alternator output. It should have a voltage of 13.0-13.8v for a normal charging battery. Internal voltage regulators are set to keep the battery charged when all the devices are being used. Check the large nut at the back of the alt to see what that voltage is. It holds the large cable to the battery to the output terminal of the alt. Then check the small wire terminal for power when the ignition switch is turned on. This activates the alt to turn on and charge the battery. Sometimes there is a mega fuse in the main fuse/relay center under the hood for the alt, check that also. Problem should be fixed now. I presume vou've already checked the cables are clean and not corroded to the battery, that will mess up everything all by itself.

Dec 19, 2010 | 1997 Chevrolet S-10 Pickup

2 Answers

Not charging battery


check the alternator at a repair shop or auto parts store .they can put a gauge on it

Dec 03, 2009 | 1997 Ford Econoline

1 Answer

When i turn the lights on the car shuts off. 74 cadalina


This sounds like a low battery voltage problem, and the cause of this is a inadequate charging system. There is enough battery to initially start the vehicle and possibly keep it running for sometime. But, when you turn on your lights the headlights need alot of power and if the battery doesn't have it and the alternator doesn't offset the load, everything comes to a stop. Have the charging voltage checked at the battery terminals. You should get a reading within the range of 23.6 to 24.2 volts. The lower the voltage the higgher the charge amps and the higher the voltage the lower the charge amps. If the charging is at 13v or lower your alternater is charging at or near its output capacity and indicates the battery is going bad. On the other hand if it iis charging above 14.2, the alt. is not charging or too little outpuut and should be or needs to be replaced. It is important to have clean battery connections.
Above 14.2 = bad Altenater
Below 13,6 = bad battery
A bad battery will causr the alt. to overheat and fail
A bad alt will cause the battery to boil and overheat damage will result
Good Luck, _Ned_.

Oct 30, 2009 | Pontiac Catalina Cars & Trucks

2 Answers

What will cause a 1999 dodge diesel not to charge?? I have put new alt. on it and checked everything i know to check


How old are your batteries ? Diesels take a lot of juice to turn them over, I had a similar problem once, turned out to be the positive cable leading between the batteries.I would get a diagnostic on it to confirm your problem, could just be something simple.

Sep 01, 2009 | 1998 Dodge Ram 3500 2WD

2 Answers

Battery light on


It is possible that the extra demand placed upon the charging system finally blew the alternator.
You need to have the charging system checked,,or check the output yourself with a volt meter (should be around 14-15 volts) test must be done with the car running.
If the voltage reads up to 14 or 15 volts then it would indicated a short in the dash control circuit.

Jan 30, 2009 | 1990 Pontiac Bonneville

5 Answers

1997 isuzu rodeo


start the car,, leave the car on and disconect the battery if the car still on the alt is good but if the car turn off Replace the alt

Sep 06, 2008 | 1996 Isuzu Rodeo

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