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        General >> Problems >> Battery warning light
        
(Message started by: hopper on Dec 24^th, 2008, 9:02pm)

Title: Battery warning light
Post by hopper on Dec 24^th, 2008, 9:02pm

Hi Again,

The battery warning light comes on intermittently, I've used the diagnostic test from the dashboard and notice the alternator is charging at 13.6-13.8volts when driving but when the heated screens are switched on the voltage drops to 12.1-12.2volts. I presume it is the alternator that needs replacing as no matter what is switched on the car should register over 14.4v at all times.

Regards Chris

Title: Re: Battery warning light
Post by pinto on Dec 25^th, 2008, 3:03pm

Sounds like the alternator is not long for this world, but theres a possibilty that it could just be a failing rectifier pack (the little black box on the plug end)

These used to be fairly easily available from LSUK, but since they went bust, electrical suppliers are harder and harder to find - probably best off sourcing a s/h alternator from a scrappy or parts wanted on this forum

Title: Re: Battery warning light
Post by hopper on Dec 25^th, 2008, 6:44pm

Hi Pinto,

I've sourced a recently reconditioned alternator only 3 months since recon £40 instead of £87 full price. Once received and fitted i'll confirm if this rectified the fault.

Regards Chris

Title: Re: Battery warning light
Post by matt1987 on Dec 26^th, 2008, 12:27am

the battery light comes on due to a incorrect charge or malfunctioning part, the part in question is the diode pack , a diode pack only allows a dc charge to exit and no charge can go back through. it is a one way system. this will bring the light on indicating a fault to the driver like a engine management light. ;D

Title: Re: Battery warning light
Post by Highlander on Dec 26^th, 2008, 12:39am

on 12/24/08 at 21:02:59, hopper wrote:

no matter what is switched on the car should register over 14.4v at all times.

my 24v's sit around 13.6 to 13.9, i only get 14 if i rev it hard

Title: Re: Battery warning light
Post by hopper on Dec 26^th, 2008, 6:58am

Hi Highlander,

What does your battery indicator read in diagnostic mode when you have your heated front and rear screens on please?

Regards Chris

Title: Re: Battery warning light
Post by hopper on Dec 26^th, 2008, 7:01am

Hi Matt1987,

Where is this diode pack situated on a 24v

Regards Chris

Title: Re: Battery warning light
Post by Snoopy on Dec 26^th, 2008, 8:19am

In the back of the alternator Its the rectifier part of the alternator. It will be found.! ;D

Title: Re: Battery warning light
Post by hopper on Dec 26^th, 2008, 10:34am

Hi Snoopy,

Thanks for the info I'll have a look at this tomorrow and post the results

Regards Chris

Title: Re: Battery warning light
Post by matt1987 on Dec 26^th, 2008, 11:18pm

got it in one snoopy

when the battery light comes on it seems to be at fault with the alternator best bet and cheapest is to get another one. rather than messing about with them u can get repair kits seen them on ebay but it just aint worth it unless you can strip it down pretty quick and rebuild it with all the parts. with my experiences at work it is best to replace rather than repair.

Title: Re: Battery warning light
Post by Highlander on Dec 28^th, 2008, 12:33am

on 12/26/08 at 06:58:56, hopper wrote:

Hi Highlander,

What does your battery indicator read in diagnostic mode when you have your heated front and rear screens on please?

Regards Chris

Much the same on full load, drops slightly to 13.4/13.6