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Alternator ignition light not going out

 
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Fishmm51
5th gear


Joined: 28 Jul 2015
Posts: 80
Location: NSW Upper Hunter

PostPosted: Thu Feb 08, 2018 8:21 pm    Post subject: Alternator ignition light not going out Reply with quote

We changed the alternator / ignition light out for a led light now it Won’t excite and go out and alternator won’t charge Tried to put a resistor in the line to help excite, the led but it won’t go out.
Put the old globe back in place it all works.
Anyone come across this problem?
Can you change it ?
And how did you sort it out

Cheers in advanced

Tristan


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Scouse
moderator


Joined: 15 Sep 2003
Posts: 4907
Location: Wollondilly, NSW

PostPosted: Fri Feb 09, 2018 6:25 am    Post subject: Reply with quote

The alternator exciter circuit needs a 12v feed for it to kick in. You'll find it will self excite if you give the engine a rev.
The LED is a diode which only allows current to flow one way, in your case from the alternator to the battery. It won't allow current from the battery to the alternator for the exciter circuit to operate.



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