Dont know computer says engine electrical problem,blower comes on and runs the battery down,ruin the battery and the alternator, kids got in and turned the radio on while on charge fried the diodes in the alternater which caused me to over charge the battery because alternater wasnt.
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THAT IS ODD UNLESS THE TRUNK HAD BEEN OPEN/ CAR SITTING & WEAK BATT DRAINING W ELEC SHORT. NO PUN INTENDED! OPEN THE TRUNK & TRY AGAIN., DONT THINK IT WILL, BUT IF NO START CK BATT CONN , BOOST.& HAVE BATTERY ,ALTERNATOR CHECKED ALONG W/ PROPERLY HAVING IT CKD FOR ELECTRICAL SHORTS. if IT WAS SITTING AROUND A WHILE WITH THE TRUNK AJAR,CLOSE THE TRUNK BOOST IT, RUN IT TO RECHARGE THE BATTERY BY ITSELF (20MINS) SHUT IT DOWN, RESTART CK LIGHTS,HORN, ETC. ALL WELL YOU GOOD TO GO. NO START AGAIN THEN THERE'S AN ISSUE W/ THE BATTERY & POSS AN ELEC SHORT.. GOOD, FRANK M
Sounds like it to me but i would test it first in case the warning light control is faulty ,start engine run at 1500 rpm then disconnect the neg lead and see if keeps running then if it runs turn on lights blower and so on if keeps running then alternator is ok
My 2000 Caravan developed this problem after our hard winter so I searched and found that tapping the alternator might reveal that the brushes were intermittent. Sure enough, a slight tap caused the charging voltage to come on at around 14 Volts. A new brush assembly was under $10 on eBay and after finally getting the alternator out and the brushes replaced, re-installed all was well!
It sounds to me like your alternator decided to give up the ghost. The battery did not have any voltage because there was probably just barely enough power to get the engine started. Then when the voltage got low enough, your onboard computers could no longer function properly and the engine died. However, the battery continued to discharge because the ignition switch was on and all of the systems were still TRYING to operate. Yes, this will cause the entire electrical system to shut down....No battery power causes everything to stop operating. Without the alternator, there is no way for the battery to get recharged.
What you must do is to recharge the battery and test it to make sure it is not dammaged or shorted. Also relace the battery if it does not test good when it is fully charged (many times, a shorted battery cell is what causes an alternator to go bad). The alternator is definately not working, because it would have kept the engine running even if the battery was bad.
In short, you need to replace your alternator and possibly also your battery.
Check the gauges, if the car
is equipped with them. If you have a volt/amp gauge, it will read the
alternator output for you. Turn on the blower fan for the AC or Heater,
the headlamps, and any other accessories that put a strain on the
alternator, and watch the gauge to see if it decreases voltage or
amperage. As a rule, if the voltmeter is higher when the engine is
running then when the engine is not, you can confidently assume that
the alternator is charging.
Open the hood, and with the car engine off, loosen the negative battery cable so that it can be removed with little effort. With the battery
cable still loosely attached to the terminal, crank the engine, then
pull the battery cable completely free of the terminal. If the engine
continues to run, the alternator is providing enough voltage to power
the electric circuits that provide spark to the spark plugs, electric
fuel pumps, etc. You can increase the demand on the alternator by
turning on headlamps, heater blower fans, and other electrical
accessories to determine the draw capability of your alternator. If the
engine immediately dies when the cable is removed, the alternator is
1. Put a voltmeter as close to the
alternator as possible. (Positive and Negative both.) If you can put
the meter leads directly on or in the wire coming off the alternator
that would be optimum.
2. Now start the car and turn all
accessories off and check the voltage level. It should be between 13.5
and 15.1 volts. (depends on your make and model of car) It is a good idea to write down all voltage readings your taking.
The main thing your looking for is a drop in voltage. Once you hit
around 12.5, your alternator is not going to produce any additional
3. Now turn on one accessory at a time. Write down
that accessories fuse rating. Keep turning on accessories and adding
fuse ratings until the voltage falls to 12.5. Now add 15 amps if your
electric cooling fans are on and 10 amps per battery in your system.
Your numbers may look like this.
Hi,I am Ron,Look at the alternator out put voltage,and have the battery load tested.Also check bad connection from battery to alternator(this is the large wire/cable).alternator turns the battery light on,why?You need to figure out witch one.A diode could be going out in the alternator,diodes change ac voltage to dc voltage ,that`s why the call it a alternator(alternating current)AC voltage means alternating current. If it goes unrepaired it can ruin battery,changing battery voltage from 12 volts dc to 12 volts ac.Also there is a built in voltage regulator that holds voltage down to about 14 volts charging while car is running.Voltage regulators can cut off charging completley or open wide allowing alternator to charge as much as 18 volts dc,ruining battery(boiling battery acid out of battery)and ruining alternator by burning fields and rectifiers out.So have it checked or do it your self.Auto parts stores can check alternator and battery.If I can be of more help,please email@example.com
Several possibilities come to mind. a bad ground connection between the engine and the chassis will do this. Install an additional ground wire from the battery negative terminal to a good clean bolt (at least 5/16" diameter bolt) on the engine. Ford also had problems with the field electrical connector melting where it plugs into the alternator. Check for both of these problems and install a new alternator. Does the battery go dead if the car sits for a week? If so, something is not turning off and is drawing the power out of the battery. This will cause the alternator to work very hard when the car is first started. This will damage the rectifier inside the alternator, ruining it. Charlie PS High quality re-manufactured Ford alternators will come with a new field connector and instructions on how to install it.