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General => The garage => Topic started by: minid0m on 03 May 2005, 17:59

Title: New Battery
Post by: minid0m on 03 May 2005, 17:59

I tried to start my mk2 8v gti today and the battery was completely flat, I then jump started it, drove about 15 miles and turned it off and wouldn't restart.

If i need a new battery where should i get one from?

Title: Re: New Battery
Post by: rubjonny on 03 May 2005, 19:11

Take it to Halfords they'll test it for free.  Their batteries are good quality ones rebranded too apparently.  Check the voltage across the terminals when the engine is running it should be 13-14.5v, if not the alternator isn't charging for some reason!

Title: Re: New Battery
Post by: minid0m on 03 May 2005, 19:43

went to halfords got a heavy duty one as the original was dead.  will have to test the alternator another time, perhaps tommorow as I don't want to f**k up the new battery... It cost £55 ouch! I sometimes wish I still had my mini...

Title: Re: New Battery
Post by: Gambit on 04 May 2005, 09:32

if the alternator aint chargin properly then the red light will constantly show on the dash

Title: Re: New Battery
Post by: rubjonny on 04 May 2005, 09:38

Will it still light up if the blue wire to the alternator is disconnected?  I was under the impression that it didn't but I might be wrong.

Title: Re: New Battery
Post by: diagnosis-dub on 04 May 2005, 16:20

The blue wire from the alternator makes the dash light go out as it is positively charged when the engine is running.

Title: Re: New Battery
Post by: minid0m on 04 May 2005, 16:22

Went back to halfords and got them to test the alternator, which turned out to be fine, except was found to be charging a little less then it should with all the tunes turned up! No problems though

Title: Re: New Battery
Post by: diagnosis-dub on 04 May 2005, 16:24

On most bosch alternators you can just replace the brush/regulator unit on the back for a new one and this solves the charging problems. :wink: