SP2 battery charging issue |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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I think what this actually does is power up the electronics in the regulator. The transistors need Voltage to start working. So yes the red or red/black to ignition switch is essential. I agree the blue is merely a switch (a transistor most likely) that just turns the light on and off. If so, it won't like being connected direct to battery positive or ignition switch output. |
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"Chicken nuggets don't dance on a Tuesday."
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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What exactly is "higher revs" (i.e. rpm) (No won't charge at idle. This is normal.) What's the Voltmeter? Spada dash Voltmeter? Have you got a more accurate multimeter to use? |
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"Chicken nuggets don't dance on a Tuesday."
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Appendix: yes could be the croc leads are not letting enough current through if you're using them to connect alt to the battery, and causing a Voltage drop |
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"Chicken nuggets don't dance on a Tuesday."
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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The onboard voltmeter is a very inaccurate device, and it's also on the end of a long wire, which in turn is across another circuit with a load. All these tend to make the voltmeter read low. You would probably see considerable fluctuation when you put the brake light on. Best to check across the battery terminals with a multimeter. What is your tickover set at? On my SPIII it was set at about 1000, and the light was on. This gave me a problem at an MOT because the tester left it on tickover for some time. Then we had a problem with the rear light dimming with the indicator, all due to the battery discharging. I raised the tickover to 1100 and everything was much better.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Indeed, and I used this to checked my brake bulb still worked when riding. Perversely, the last such dash Voltmeter I tested compared quite well against my Fluke DMM. |
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"Chicken nuggets don't dance on a Tuesday."
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Actually the voltmeter is quite accurate, it's the wiring which causes the inaccuracy.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Yes, I'd just thought of that. |
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"Chicken nuggets don't dance on a Tuesday."
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tomgudgeon
Senior Member Joined: 17 Oct 2019 Location: London Status: Offline Points: 106 |
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Hi Guys
I'd just like to conclude this issue by saying I never figured it out. It could have been my new wiring or a faulty stator or Reg/rec. I have no idea. I ended up just buying a new charging system (stator and rec/rec). It was expensive but I heard that old Guzzi's never charged properly and with my new M-unit and looms, the new system just plugged straight into the battery terminals without the need for an idiot light. So I saw it as an investment in the future workings of the bike. Works like a dream now and charges perfectly.
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