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Wits View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wits Quote  Post ReplyReply Direct Link To This Post Topic: Eletrickery
    Posted: 14 May 2014 at 11:22
Found this on the Wild Guzzi site, may be of interest to some.
Written and posted by John Noble...


http://www.thisoldtractor.com/guzzitech.dk/pdf/charging-around-the-circuit-john-noble.pdf

Edited by Wits - 14 May 2014 at 11:27
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Gianni View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gianni Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2014 at 18:06
Good reading.

The elusive resistor he mentions in the charging circuit is available as a Guzzi part. It comes with the relevant wires already attached. I have retro-fitted them (very easy - just two plugs) to early models and found they seem to improve low-end charging (more volts at lower revs) for no apparent cost.

Any one else tried this and what was your experience?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2014 at 01:11
I've seen worse such documents! Big smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pariah Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2016 at 09:26
Thanks, that's a useful document. Saved.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2016 at 10:52
Having now just read through that, I see that the elusive resistor is only there to keep the system going in the event of the charge warning light failing. I always wondered simply because I know of no other three phase electro magnet alternator which uses it.
It will slightly increase the start up current through the rotor coil, which might make the alternator produce an output at lower revs.
 
However he also says the charge warning light can be replaced by an LED. This is nonsense as unless you also have a shunt resistor on the LED you won't get any charge from the alternator. Thus there is absolutely no point in doing it.
Obviously putting a resistor instead of a bulb will work, but you would have no indication of whether the system was charging or not unless you also install a voltmeter.


Edited by Brian UK - 02 Dec 2016 at 10:56
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrD Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2016 at 21:44
My LM-II did not have the elusive resistor and I have placed a 2k resistor in parallel to convince charging system the correct bulb in place as my console uses LEDs - my little orange voltmeter says the magic smoke is getting to the battery
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2016 at 23:23

I would have used a lower resistance than that, nearer 200 ohms.

Brian.

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