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jeffyjeff |
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 jeffyjeff World Chat Champion

Joined: 02 May 2020 Karma :   
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 Posted: 05:53 - 22 Dec 2024 Post subject: |
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Kawasaki Jimbo wrote: | ... it’s not the fault of any of the fused circuits (horn, acc, fan, turn, ignition, taillights, headlight). What else could it be, and how would I test? All I can think of is the starter motor, alternator, or what remains of the old alarm loom? |
If you have indeed tested and are completely sure that your fault is not in any fused circuit, then the problem must lie in an unfused circuit. As Nobby stated early on, the rectifier is high on the list of suspects because the diode bridge connects to the battery, to the stator coils, and to earth. I don't think anyone suggested testing the starter relay yet. The coil contacts are switched, but the relay contacts switch battery power directly to the starter windings; an electrical leak path might have developed therein. You mention an old alarm loom, or some fragments thereof. That would raise my suspicions, since that is a deviation from OE. You might look further into that.
To test, set up your ammeter and systematically remove the R/R and the starter relay. As for the alarm loom, you need to find where it sourced power for the alarm. Quite likely the alarm had an unswitched power source, since the alarm was intended to be working when the bike sat unattended. ____________________ History shows again and again how nature points out the folly of men - BOC |
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Kawasaki Jimbo |
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 Kawasaki Jimbo World Chat Champion

Joined: 09 Oct 2015 Karma :    
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 Posted: 16:11 - 22 Dec 2024 Post subject: |
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I recall I had this same problem when the alarm was still in place, but what remains of its loom could be draining the battery somehow I suppose. I really didn’t want to get into stripping that out.
Latest current readings with a much better quality meter are,
10mA between negative lead and terminal. (The Yamaha R1 for comparison has 0.3mA, including immobiliser.)
still 10mA with reg/rec disconnected.
10mA with all circuit fuses removed.
10mA with fuel pump disconnected.
8mA with main 30A fuse removed.
By a process of elimination it seems likely to be the starter motor but I couldn’t see or reach the connection to try it. I’ll tackle that another day.
I also found this battery website -https://www.batteriesinaflash.com/battery-run-time-calculator?srsltid=AfmBOory8v2nZZoqrlk22Okbr-HMVQkxGDogoZp56fcX4cvN_S51BR7i which suggests my 8Ah lead acid battery with the 0.01A draw would last 571 hours or 24 days, which tallies with what I’m getting. 10mA is too much draw. |
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Nobby the Bastard |
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 Nobby the Bastard Harley Gaydar

Joined: 16 Aug 2013 Karma :  
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Kawasaki Jimbo |
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 Kawasaki Jimbo World Chat Champion

Joined: 09 Oct 2015 Karma :    
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 Posted: 12:55 - 23 Dec 2024 Post subject: |
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Thanks. I’ve pulled the faded red plug off the top of the starter solenoid. Current between negative battery terminal and battery post is 9mA. I’m not sure that’s the test you’ve told me to do though, Nobby. Is that good enough to confirm the starter circuit is not guilty?
https://i.postimg.cc/wjyTB5gL/IMG-1649.jpg |
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Nobby the Bastard |
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 Nobby the Bastard Harley Gaydar

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Kawasaki Jimbo |
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 Kawasaki Jimbo World Chat Champion

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Nobby the Bastard |
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 Nobby the Bastard Harley Gaydar

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Kawasaki Jimbo |
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 Kawasaki Jimbo World Chat Champion

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Nobby the Bastard |
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 Nobby the Bastard Harley Gaydar

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Kawasaki Jimbo |
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 Kawasaki Jimbo World Chat Champion

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jeffyjeff |
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 jeffyjeff World Chat Champion

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 sickpup Old Timer

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Nobby the Bastard |
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 Nobby the Bastard Harley Gaydar

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Nobby the Bastard |
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 Nobby the Bastard Harley Gaydar

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jeffyjeff |
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 jeffyjeff World Chat Champion

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 Posted: 20:16 - 23 Dec 2024 Post subject: |
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I would inspect the harness for places where someone might have tapped into an OE conductor. One obvious clue would be the presence of "scotch locks". Scotch locks work OK when new, but they do not wear well. I would keep an eye out for a connection that looks like this:
https://live.staticflickr.com/65535/54223231383_9b5c817f18_m.jpg ____________________ History shows again and again how nature points out the folly of men - BOC |
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Kawasaki Jimbo |
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Raffles |
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 Raffles World Chat Champion
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