I just got a 1998 trooper and the battery totally died on me. I brought it to get checked, and they told me that my alternator was bad. I am getting a new one but if i can save money, I want to put it in myself. (Seeing that the alternator costs 200$) does anyone know how hard it is to do it. Or should I get it done by a pro? Thanks
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Re: Need to change the alternator.
I can tell you this is not that hard. just before you star check if you have the rigth tools ' all of them than take look what has to be taken off from around the alternator if you strong enoug do it some bolts. o nuts are frozen.but if everything goes nice and easy.for the firs time may take all day be patiente.good looooook
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It sounds like an alternator related issue. Once the battery drops below 12 volts it will do lots of silly things with gauges and thats why when you change it all works fine. Check that with engine running with a volt meter you have 13.8 to 14.2 volts across the battery, if not you may have an alternator issue
No. In every charging system I have seen the alternator output is direct to the battery, however the control that regulates the alternator output can be performed in variety of ways.
You need to check the wiring diagram to discover how yours is controlled.
Most alternators since the late 1970's are self contained generators but there are recent developments such as smart charge systems that feature a certain amount of computer interference.
A rough idea of the system can be formed by the number of connections to the alternator. A "normal" machine-sensed setup requires only two wires - the output connection and a thin cable from the ignition/charging/battery light, though an alternator mounted in rubber bushes will also require a heavy ground bonding cable.
"Car stops on occasion" Then what happens? Does it need a jump to start back up or just let it sit and it starts? If the alternator is bad the battery then takes over running the vehicle. The battery is only made to crank the motor and when the car starts the alternator takes over and charges the battery back up. If the battery is running the car it will eventually run out of power and the car will die. If the car dies because of a bad alternator it will not start unless jumped or new battery put in. I really don't think alternator is the cause of that problem. I'd say don't do it unless you can pinpoint problem.
Check if the alternator output is 13 volts to 14 volts or when the engine runs try to disconnect the negative (- ) terminal from the battery, if it still runs your alternator is okay. Just to check if that new alternator works.
If the procedure that I have told you is working, the battery must be brought to the nearest battery center, they have a load tester that will definintely assess the battery's condition if it really good or needs to be replace.
Well, not necessarily a fuse, but a current draw. You need to find the draw.
Pull the fuse for the interior lights (so you can open doors and not alter your tests) and clock. Take off negative battery cable and put the volt meter or test light in series between batt terminal and cable. If the light lights or volts higer that a couple of volts, disconnect items one at a time and re test.
Start with the alternator, it is the most likely. It has a series of diodes that change current from alternating to DC, when one fails it leaks current. The unit may still charge, but not as well as with good diodes. The only test for diodes is a scope, or take it apart and test them individually. Use ohms and current flow in one direction, reverse test leads and no current. Failed diode will flow or connect in both directions.
Anyways, you will have an answer pretty quick if you test battery current draw and disconnect one system at a time and retest.
You may have received a faulty alternator from the store. I have bought alternators from AutoZone before and in one instance had to take it back 3 times before I got one that worked correctly.
Also, you should not have jumped the car, you should have started it up on battery and alternator. That would have told you if the battery was drained or the alternator you had just put in was bad. If you put the drained battery back in the car to run it, the car would have died anyway. Whenever I have changed an alternator out I always let it run in the driveway for awhile to make sure that both the battery and alternator are functioning correctly.
Need a new battery first, or charge the battery...if the battery is over 3 years old, I would just replace it, also may need a higher output alternator with more amps, to run the electronic fuel injection, fuel pump, and ignition etc...