John.Taylor
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| posted on 22/5/08 at 09:06 PM |
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Denso alternator switched live L terminal giving 0.3v with both ignition on but not started and engine running???
My Denso alternator has the B (to battery) post, and just the two (L & IG) spade terminals.
With B connected to battery +, IG fed 12v from the ignition, and L fed with 12v from the ignition via the bulb I get 0.3V out of the L spade terminal
when the ignition is switched on so the bulb doesn't come on. When the engine is started nothing changes?
[Edited on 22/5/08 by John.Taylor]
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Dusty
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| posted on 22/5/08 at 09:26 PM |
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12v to extinguish the light on the dash when then engine is running. With engine stationary the lamp has 12v to it from the battery and the L terminal
earths the lamp thus lighting it to inform you that the alternator is not charging the battery. When you start the engine then you get 12v+ to balance
the supply to the lamp, 12v both sides = light out.
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Mr Whippy
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| posted on 22/5/08 at 09:36 PM |
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^ yip
Fame is when your old car is plastered all over the internet
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John.Taylor
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| posted on 22/5/08 at 09:39 PM |
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I'm really not getting this alternator wiring.
I have connected both the IG and L spade terminals with 12v feeds off the ignition that come live when the key is turned, but put a lamp in line with
the L feed?
When I turn the ignition on, but don't start the car, I get 12v to both the IG and L spade but the lamp (which works) doesn't come on. It
appears to me that the L spade isn't earthing?
Could this be true and what does it mean?
[Edited on 22/5/08 by John.Taylor]
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Dusty
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| posted on 23/5/08 at 12:36 AM |
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Here's the circuit. Been posted before.
[Edited on 23/5/08 by Dusty]
 
Rescued attachment Denso.JPG
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Macbeast
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| posted on 23/5/08 at 03:39 AM |
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Take the wire that goes to the L connector off the alternator and touch it to the engine metal ( stick a spare male spade into it to act as a probe )
With ignition on, lamp should light. If not you have a high resistance - poor connection perhaps - in the feed to the lamp.
If it lights in above, touch the L wire to the alternator body. If it lights the alternator is faulty and as you say the L connector is not presenting
an earth. If it doesn't light the alternator body is not earthing to the engine block and you have made your alternator mounts out of rubber 
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