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Old 25th November 2008, 16:34   #1
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Default Battery Light coming up on low rpm

Dear All,

This is regarding a problem, with a friends car, which I was using.
The Battery light on the dash used to light up as the car used to idle. (The idling rpm is not abnormally low) .
On giving some accelerator, the light used to go off. Its worse with the headlamps on. In case of no accelerator, the car used to stall.
I think its a faulty alternator not charging up on low rpms.

Gurus pls advice on the fault.
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Old 25th November 2008, 16:40   #2
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If the alternator is faulty then typically it should not charge even at high rpms. But you have mentioned that accelerating a little stops the problem. Dont think it is an alternator issue.

Last edited by vikram_d : 25th November 2008 at 16:56.
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Old 25th November 2008, 16:55   #3
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what were the Idle RPMs ?
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Old 25th November 2008, 17:06   #4
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Hi Kavesh55

I had the same problem with my M800 sometime back. It was the alternator that needed attention. Once that was done the problem automatically disappeared.

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Old 25th November 2008, 17:14   #5
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kavesh what car is it and year?
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Old 25th November 2008, 17:17   #6
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check battery leads if they are properly tightened and correct idle rpm.
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Old 25th November 2008, 17:23   #7
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Hi,

Slipping alternator belt?
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Old 25th November 2008, 17:29   #8
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Slipping alternator belt would have caused a screeching sound. Dont think that is the cause as he would have noticed it.
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Old 25th November 2008, 17:36   #9
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Weak dioads, weak rectifier, worn out carbon brushes or even short coils inside dynoma get it checked.
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Old 25th November 2008, 18:11   #10
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Quote:
Originally Posted by Perez View Post
Hi Kavesh55

I had the same problem with my M800 sometime back. It was the alternator that needed attention. Once that was done the problem automatically disappeared.

Regards
perez
what was the attention given, mean what replacements were done ?

Quote:
Originally Posted by Shashank.A View Post
what were the Idle RPMs ?
Does not have a tacho, so dont know. but have driven the car before and the issue never cropped up.

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Originally Posted by white_vdi View Post
kavesh what car is it and year?
its a 1993 M 1000
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Old 25th November 2008, 18:13   #11
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Quote:
Originally Posted by vikram_d View Post
Slipping alternator belt would have caused a screeching sound. Dont think that is the cause as he would have noticed it.
you are right, no belt slipping here.

could it be a alternator issue of a lesser degree, thats why charging at higher rpms.
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Old 25th November 2008, 18:13   #12
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Quote:
Originally Posted by kavesh55 View Post
Dear All,

This is regarding a problem, with a friends car, which I was using.
The Battery light on the dash used to light up as the car used to idle. (The idling rpm is not abnormally low) .
On giving some accelerator, the light used to go off. Its worse with the headlamps on. In case of no accelerator, the car used to stall.
I think its a faulty alternator not charging up on low rpms.

Gurus pls advice on the fault.
Replace your alternator. Nothing else will do. Believe me, i know these symptoms
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Old 25th November 2008, 18:27   #13
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Get the alternator checked by Bat Mobile from Exide. If they say the alternator is not working properly, get it serviced or replace the rectifier or replace the whole damn alternator. The costs respectively are around Rs 350, Rs 1200 and Rs 6000 in Calcutta. Don't know about your city. Best of luck. But do get the battery guys to test the alternator first. It's free.
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