I put a Alternator on my 1999 Contour and I think it's charging like it should. I tried to take the Negative battery cable off with the car running and it goes dead . I checked the back of Alternator with a amp gage ind it shows it's charging. When you give it gas the meter goes higher , when it's just ideling it's about 13 volts. What could it be ? does anyone have any ideas on what I could do? Glen
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Use a volt meter or test light, disconnect the negative battery cable from the battery post. If the meter reads 12 volts or if the test light is lit start pulling one fuse at a time until the meter reads zero or the test light goes out.
Make note of what circuit the fuse protects then start working your way back from there. It cold be as simple as a dome light being left on but you need to narrow down where the problem may be located.
not really! if it runs pull of the negative battery cable while running and if it keeps on running your alternator still good! or start it and put voltmeter to the red on battery and if reads 13.5 about then alternator good!! while not running the battery should be 12 volts!
REPLACE BATTERY CABLES SEE IF HELPS THE PROBLEM.TURN OFF RADIO BEFORE DISCONNECTING NEGATIVE BATTERY CABLE TO KEEP FROM LOCKING OUT THE RADIO.MOST OF THE TIME A BAD BATTERY GROUND CABLE OR EITHER CABLE WILL CHARGING PROBLEMS.DUE TO HEAT STRESS UNDER CAR HOOD BATTERY CABLES CAN BREAK AND CRACK CAUSE CHARGING PROBLEMS TO THE ALTERNATOR.
You could also have a bad battery. If it's putting a strain on the charging system, it will undervolt the whole system. And you need an OBDII sensor reader to get rid of the shifting problem. Your transmission went into limp home mode because of the undervolt. Disconnect the battery for a couple minutes, reconnect the battery and restart the car. Then disconnect the negative cable while the car is running. If the battery light goes off with the cable off, your battery is bad. The problem with electrical devices is that when one thing goes bad, a lot of things go bad because of the first thing. If that doesn't help, take your alternator back to where you got it and have them test it.
Your alternator may be on it's last leg. Start the car and while the car is running, remove the negative cable from the battery. If the car dies, the alternator is no longer working. If you have a volt meter, put the meter on the battery positive and negative. You should read 13.8 - 14.2. If it doesn't show this, and reads under that, your alternator is not charging enough to keep your accessories going.
Along with the solution provided above be sure to hook up the positive cable Red to the positive cable on the car to be jumped and the car used to jump the battery both cars off. Next on the car with the dead battery hook up the negative cable to the frame of the car if it is a liquid or lead acid battery, next hook up the negative cable to the car that will jump the other dead car. Warning an arc can cause an explosion if there is gas coming from either battery so when hooking up the negative cable be sure to clamp the negative cable on the frame. Next start the car and rev it to about 800 RPMs hold it to 800 RPMS for about 5 minute's before try starting the other car, this will allow the other battery to charge up and will help start the car. If you have small jumper cables like #6 copper give it about ten minutes to charge before try starting or you could damage the alternator of the charging car. once the time has elapsed try starting the other car, push throttle down once while cranking it over and hold pedal half way till it starts, do not crank for more than 30 seconds if it does not start wait for the battery to charge up again to try starting. with low voltage condition if you crank the car and it slows down it can damage the computer by drawing to much amperage caused by low voltage.
Jumper cables have two colored cables. The red one goes from your vehicle positive battery terminal (+) to the other cars positive terminal (+)
The black goes from your negative terminal(-) to the other cars negative terminal (-)
Your car should start within 5 to 10 minutes if you have good connections.
Get your charging system checked to see if your battery is bad, or your car charging system is not working.
I've put in hundreds of alternators sometime a new one doesn't work properly you heed to check the voltage output of the vehicle running to see if it's charging or simple remove the negative battery cable while the vehicle is runnig, if it keeps running the alternator is working if it's dies it's not but you need to know the voltage output most vehicles it's 13.5 min.