Battery Voltage 12Volts?
16 October 2006, 12:55 PM
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Battery Voltage 12Volts?
3 days ago i bought a 2004 STi.
The previous owner informed me that has changed 1 year ago in warranty the alternator and the battery.
From curiosity i measured today the Bat Voltage and realized that if there is no electrical consumption from the heater or lights or defog switch the BV is 12-12,3 Volts only, like the alternator is not charging.
If i turn on, one of the above devices the BV is 13,9-14,1 Volts (i find this right).
I checked the BV on 2 other cars, a 2003 WRX and a 2003 STi, and i saw that they have constant 14 Volts no matter the electrical consumption.
What can be wrong with the charging system on my STi?
The car has only a clifford alarm system installed.
Any ideas would be really helpful.
Christos
The previous owner informed me that has changed 1 year ago in warranty the alternator and the battery.
From curiosity i measured today the Bat Voltage and realized that if there is no electrical consumption from the heater or lights or defog switch the BV is 12-12,3 Volts only, like the alternator is not charging.
If i turn on, one of the above devices the BV is 13,9-14,1 Volts (i find this right).
I checked the BV on 2 other cars, a 2003 WRX and a 2003 STi, and i saw that they have constant 14 Volts no matter the electrical consumption.
What can be wrong with the charging system on my STi?
The car has only a clifford alarm system installed.
Any ideas would be really helpful.
Christos
16 October 2006, 01:04 PM
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Imprezas use a 'smart' alternator which doesn't charge unless something is switched on. I don't think you have anything to worry about unless your car doesn't want to start.
18 October 2006, 07:33 AM
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I checked one more WRX04 and had the same charging "attitude" as mine.
But i made a step further.
I swapped my ECU (AH990) with the ECU from another STi 04 and what i realized is that with the new ECU my car had all the time 14Volts and the other Sti the previous charging attitude (charges only when a load is applied).
Any comments?
Christos
But i made a step further.
I swapped my ECU (AH990) with the ECU from another STi 04 and what i realized is that with the new ECU my car had all the time 14Volts and the other Sti the previous charging attitude (charges only when a load is applied).
Any comments?
Christos
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