如何判断发电机是否坏了?

[mchao_l]

我的车打不着火,去CT换了新电池,但没做检查,不知道是不是因为发电机坏掉了.现在都不敢开这车了,有什么方法检查一下吗?谢谢.

 

[camarade]

start the vehicle,
turn on all the lights,
disconnect the battery cable terminals while the engine is running.If the engine stall,that means the alternator is not working properly.

 

[mchao_l]

Well, then, thanks man. I did the same test both in today and yesterday. As you pointed, after I unpluged the battery, the engine died right away. I will give it up now.

 

[月下独酌]

that means your alternator is dead meat

 

[camarade]

99% is the alternator give you trouble. Follow the cable to see if there is any broken cable or loose connection before you replace the alternator.

 

[camarade]

Never give up.
Replace the alternator is very simple in most vehicles.
Go buy a rebuild one and do it yourself.

 

[Pigeon]

Do you know if you disconnect the battery cable while the car is running, it could kill your car's computer or other electrical components???

This test is ok for older car(1980 car or older) but not for newer car.


If your car is still running now, you are very lucky you did damage your car's computer (ECU).

 

[mchao_l]

多谢各位指点,我两种方法都试了,结果如下,
1.运行拔电法: 发动机继续运行2秒后死去.
2.电压测量法: 前2秒降至11V,后30秒升到14.5V,开车出去慢跑20分钟,电压降至12V,吓得我再也不敢碰这车了.
另:总觉得发电机处有焦胡的味道，估计发电机已亡是已经可以确诊了。
多谢各位，多谢黑哥。

 

[j_b_jiang]

Re: Re: 如何判断发电机是否坏了?

最初由 一抹黑 发布

用万用表,搭在电池二极.在着车情况下,14-14.6伏,发电机没问题,13.4--13.8伏,发电机弱,13伏以下,换.

请教发电机的输出电压是否与车速有关。本人这次大雪，开后窗加热线，低速行驶了一个多小时，刚停车就无法无法启动，只能通过搭他人的电池启动车了。电池是新的，不能启动时，无线电等都正常，现在又没有问题了。想了解发电机的输出电压与车速是否有关。谢谢了 。

 

[uf65ca]

最初由 mchao_l 发布
我的车打不着火,去CT换了新电池,但没做检查,不知道是不是因为发电机坏掉了.现在都不敢开这车了,有什么方法检查一下吗?谢谢.

Check these links, very useful to me:

http://www.uuhome.de/william.darden/carfaq14.htm#capacity

http://www.repairfaq.org/ELE/F_Car_Battery.html#CARBATTERY_011