All Things Mk5 > How to Guides / Troubleshooting

Battery Light On Dash

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s31teg:
Hello

Seeing if someone has any technical info or drawings to help out.

Currently have the battery light on dash (Have not done a scan yet)
Voltage is 14.4v with car on
Also have tried changing the battery temp to prove that too.

Where does the car take the output from the alternator from? The plug on right/top with the two thin wires?

If anyone has a wiring diagram or something would be great.

Thanks!

xjay1337:
usually battery light means alternator is not charging the battery.
i had a battery light on my old 1.9 tdi and it was the pulley on the alternator had gone bad...does yours rattle?
i'm crap with electrics so no help there i'm afraid.

s31teg:

--- Quote from: xjay1337 on February 22, 2015, 10:56:48 pm ---usually battery light means alternator is not charging the battery.
i had a battery light on my old 1.9 tdi and it was the pulley on the alternator had gone bad...does yours rattle?
i'm crap with electrics so no help there i'm afraid.

--- End quote ---

Yeah everything checks out ok so far thus I now need to find out where it takes this reading from.

I tried the air-con trick on no25 for voltage when it first happened and it did show low at 12.1 but when back up to 13.7 and has never dropped since. It does check out with 14.4v with a meter and I done 300 miles yesterday with lights on etc.

Note: The battery light must inhibit the heated seats and rear heated windows to help not drain the battery.

s31teg:
So the fault code came back as P1602 which is not a great deal of help.

http://wiki.ross-tech.com/wiki/index.php/18010/P1602/005634

xjay1337:
Have you tried another alternator...

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