Battery light on despite new alternator

L

LeeMacca

Member
Hi all!

So I have had an intermittent battery warning light for a while now so I changed the alternator for a reconditioned bosche one whilst I was fixing the oil filter housing gasket. Unfortunately I now have the intermittent battery warning light again! My diagnostics tool is reading 14v from the battery when the engine is on.

Anyone have any ideas what could still be causing this?

Cheers!
 
Test the battery. It's always way more likely the problem than the alternator.
Check voltage after left overnight and I'd want to see around 12.6v and again when running and charging on or over the 14v
 
cj10jeeper said:
Test the battery. It's always way more likely the problem than the alternator.
Check voltage after left overnight and I'd want to see around 12.6v and again when running and charging on or over the 14v
Click to expand...

I haven't got a volt meter or anything but I just did a test using a cheapy diagnostics tool. In the image below the engine being started is on the right hand side, the line hovered around 13/14 for a minute or so after the engine was started then stayed at 14v comfortably until I turned on all the accessorises and lights etc then it seemed to drop down to 13v and stayed there until I turned off all the accessories. Could that be more likely battery based on that?

IMG_4734.jpg
 
Not a reliable test. Sorry
You need to test the battery after it’s stood for a few hours. That tells if it’s holding the charge. Halfords will test it for free if needed
 
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