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Model specific boards => Golf mk2 => Topic started by: Deefadog on 04 July 2005, 11:50

Title: What's the blue wire on the alternator for?
Post by: Deefadog on 04 July 2005, 11:50

As above :)

Just got a new alternator to soloniod made up and just wondered what the thin blue wire was for?

cheers

Title: Re: What's the blue wire on the alternator for?
Post by: Overseer on 04 July 2005, 12:00

IIRC its the one that is live when the alternator is charging.. as people run split-charge relay activation things off this

Title: Re: What's the blue wire on the alternator for?
Post by: Deefadog on 04 July 2005, 12:08

Cheers, can't hold much though, it's only about a 5amp cable?

Title: Re: What's the blue wire on the alternator for?
Post by: Judderi on 04 July 2005, 13:31

I think its used for the battery warning light on the dash. Un-plug it and the light should come on if the cars running. It has a spade connector near to the battery.

Title: Re: What's the blue wire on the alternator for?
Post by: tobz. on 04 July 2005, 13:36

Yep it is the charge-light signal cable.
You can't draw any current from it though, if you try to draw more than about 150mA the battery light on your dash will remain on when the engine is running. In the case of a split charging system the blue wire is used to switch a relay which supplies the charging current to the second battery.

Title: Re: What's the blue wire on the alternator for?
Post by: Deefadog on 04 July 2005, 13:38

Nice one guyz! Learning all the engine bits one by one :)

Now what's that big shiney metal thing in the middle? lol

Title: Re: What's the blue wire on the alternator for?
Post by: monzablue16v on 04 July 2005, 15:27

I think thats an expensive bit don't touch it!

Title: Re: What's the blue wire on the alternator for?
Post by: Deefadog on 04 July 2005, 20:48

 :grin: