MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: s31teg on February 22, 2015, 09:35:05 pm

Title: Battery Light On Dash
Post by: s31teg on February 22, 2015, 09:35:05 pm

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!

Title: Re: Battery Light On Dash
Post by: 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.

Title: Re: Battery Light On Dash
Post by: s31teg on February 23, 2015, 08:15:03 am

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.

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.

Title: Re: Battery Light On Dash
Post by: s31teg on February 23, 2015, 07:28:20 pm

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

Title: Re: Battery Light On Dash
Post by: xjay1337 on February 24, 2015, 02:08:02 am

Have you tried another alternator...

Title: Re: Battery Light On Dash
Post by: s31teg on March 02, 2015, 02:29:57 pm

update, changed the alternator (twice as the first one was faulty)

no fault generated in vag com but the light is still there and heated seats and heated window still are disabled.

any other suggestions?

Title: Re: Battery Light On Dash
Post by: doylebros on March 02, 2015, 05:41:39 pm

In the engine bay - check the fuse box fusible links for corrosion and chassis earths.