Battery Light coming up on low rpm

[kavesh55]

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.

[vikram_d]

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.

[Shashank.A]

what were the Idle RPMs ?

[Perez]

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

[white_vdi]

kavesh what car is it and year?

[howler]

check battery leads if they are properly tightened and correct idle rpm.

[trrk]

Hi,

Slipping alternator belt?

[vikram_d]

Slipping alternator belt would have caused a screeching sound. Dont think that is the cause as he would have noticed it.

[Ajaybiz]

Weak dioads, weak rectifier, worn out carbon brushes or even short coils inside dynoma get it checked.

[kavesh55]

Originally Posted by Perez

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 ?

Originally Posted by Shashank.A

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.

Originally Posted by white_vdi

kavesh what car is it and year?

its a 1993 M 1000

[kavesh55]

Originally Posted by vikram_d

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.

[esteem_lover]

Originally Posted by kavesh55

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

[Sudipto-S-Team]

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.