LIGHT: - BULB +. If either no + or no - then NO LIGHT - Saab 900 Bulletin Board - Saabnet.com
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LIGHT: - BULB +. If either no + or no - then NO LIGHT
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Posted by Siegfried (more from Siegfried) on Thu, 19 Jul 2012 20:38:11 Share Post by Email
In Reply to: But would that, Judge Edo, Thu, 19 Jul 2012 18:55:19
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Judge,
bulb (or any thing which runs on electric current) needs BOTH + and - to be there in order to be alight. If you supply it with one potential only and leave the other pin/wire/terminal hanging in the air, then there will be no current in the circuit and thus - no light if the electric load comes as the bulb.
The batt (alt) indicator bulb gets the positive potential from the ignition switch (ignition switch relay for the later variants like yours) and the negative (ground) potential comes from the VR. So bad VR means no ground potential for the batt light which means no indication.

Please carry out those check I mentioned earlier. If you feel like reading a moonspeak, then you'd better leave it for a specialist (or wait for Simon or Justin to translate it into more friendly and readable english). Otherwise, it's a good DIY and a pretty easy one.

Zig

P.S.
If you're interested to know more about the batt light - that indicator light indicates that VR unit is being energized. And it also indicates - when fading out - that alternator assembley either goes into the self-energizing mode or that VR stops being energized because of VR internal failure or broken circuit (e.g. that very wire coming to VR or brushes or VR-to-alternator joint which gives VR the ground connection).

posted by 188.134.44...

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