Member Since: 17 Jun 2008
Location: widnes, cheshire
Posts: 117
Battery light, generator field fault
Hi guys, got the red battery icon displaying on my dash. It’s supposed to in first an mot tomorrow, is it a fail?
Checked alternator, it’s kicking out 13.9v whist engine is running. This light only appeared when I took the front console apart to clean the heater matrix and when I refitted, light was there.
Any ideas what can cause it alternator Ahmad been changed in the past by me, battery around 5 years old. Any help appreciated
31st May 2020 4:35 pm
JMack
Member Since: 02 Aug 2014
Location: Edinburgh
Posts: 1517
Clear it and the restart the car to see if it comes back on, and if it does if it's the same code.
31st May 2020 4:43 pm
beesle
Member Since: 17 Jun 2008
Location: widnes, cheshire
Posts: 117
It does come back on mate, that’s why I’m asking as I have an mot tomorrow
31st May 2020 5:19 pm
JMack
Member Since: 02 Aug 2014
Location: Edinburgh
Posts: 1517
I'm not sure if a red light is automatically a fail or just an advisory.
What's the voltage when the alternator/battery are under load. i.e with lights, heated screens, a/c etc on?
31st May 2020 5:30 pm
Sea Raider
Member Since: 01 Nov 2016
Location: None
Posts: 4450
The battery warning light is NOT part of the test and will not be a fail
As long as the car starts ok to TEST just make sure battery good if poor and needs a jump start tester could refuse to test
The UK MOT test now includes a ‘Malfunction Indicator Lamp’ check. The examiner is now required to visually check that warning lights for safety restraint systems, electronic stability control, tyre pressure monitoring systems and anti-lock braking systems are not permanently illuminated.
31st May 2020 5:42 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10372
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