Symptom: car left standing overnight or whilst at work and the car starts OK, but if a few electrical devices are turned on such as headlights, heated seat and rear demister soon after the battery warning light clicks on and this causes the rear demister to turn off. Switch it back on, drive away and it happens again and does so for maybe half a dozen times. After that, I can have everything on and no problems.
Sounds like a charging circuit / alternator / battery issue here, but what can I do to try and narrow it down. Car is booked it to the dealer next Wednesday for a computer diagnostic, but I like to 'point' them in a likely direction if I could since I'm not convinced this will show on the computer.
So far:
- After a drive, checked voltage across battery terminals = 12.2V
- Whilst idling, voltage across terminals = 14.0V
- Checked voltage across terminals about 1.5hrs later and it had dropped to 12.0V
So, does this indicate an excessive current draw on the battery after the ignition is turned off, and if so how can I measure the current draw (I have a multimeter, but not too much clue on how to use it). Or is such a drop expected?
I'll measure the voltage again later and in the morning for comparison, but does anyone know what I could investigate next?
Car is a 2004 Fabia
Thanks
SteveP
The Caterham Pages here
Edited by - SteveP on 13 Jan 2006 15:09:17