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Electric system

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Electric system

Postby uggie74 » Tue Mar 07, 2017 9:09 am

Has anyone ever came across over voltage coming up on the dash on a mk 8

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Re: Electric system

Postby devonvanfan » Wed Mar 08, 2017 10:30 am

I’ve got a 66 plate Euro 6 DCIV fitted with a single AGM battery.
I was curious to see how the battery would fair so I wired up a LED volt meter on to the dashboard via a 12V socket. It seems accurate measured against a reliable multimeter.

Here is what I’ve noted:

Vehicle standing unused for 3 or 4 days – 11.9V
Engine stopped after a long run 12.5V
Vehicle running after a long stand 14.9V (maximum I’ve ever noted) dropping typically to 13.5V constantly after an hour or so.

Never had any warnings though.

Hope this helps.
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Re: Electric system

Postby uggie74 » Wed Mar 08, 2017 11:06 am

devonvanfan wrote:I’ve got a 66 plate Euro 6 DCIV fitted with a single AGM battery.
I was curious to see how the battery would fair so I wired up a LED volt meter on to the dashboard via a 12V socket. It seems accurate measured against a reliable multimeter.

Here is what I’ve noted:

Vehicle standing unused for 3 or 4 days – 11.9V
Engine stopped after a long run 12.5V
Vehicle running after a long stand 14.9V (maximum I’ve ever noted) dropping typically to 13.5V constantly after an hour or so.

Never had any warnings though.

Hope this helps.

Thanks for your reply

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Re: Electric system

Postby p2thed » Tue Mar 21, 2017 8:31 pm

Check the black earth leads at the battery are all tight, what's the charging voltage when the message appears??
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