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Old 01-27-2021, 10:28 PM   #16
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I'd start by disconnecting the battery for a little while and see if the problems persist once it's hooked back up.
OP: I'd start by seeing if you have a parasitic draw with the key off. Would tell you if you have a short. Lots of Youtube videos showing how to do this.
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Old 01-27-2021, 10:32 PM   #17
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Maybe you made some stuff melty screwing around in there and created a short.
This. It sounds like you may have shorted a relay that is normally open with the ignition switch off. Since it's now shorted (like a light switch being closed) the circuits are powered even with the key off.

DH you some kind of engineer or what?
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Old 01-28-2021, 09:27 PM   #18
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I spent quite a while poking at things but I suspect that locating exactly where the short is may be beyond my depth. Iím currently thinking I may just attach a battery kill switch to turn off the power when not in use. Would like to get to the bottom of it though; if anyone knows a mechanic near San Francisco who is good with electrical triage, then Iíd take recommendations.
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Old 01-28-2021, 10:23 PM   #19
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I spent quite a while poking at things but I suspect that locating exactly where the short is may be beyond my depth. Iím currently thinking I may just attach a battery kill switch to turn off the power when not in use. Would like to get to the bottom of it though; if anyone knows a mechanic near San Francisco who is good with electrical triage, then Iíd take recommendations.
Do not do that. If something is running all the time when it's not supposed to, then it could fail and leave you stranded. Or worse, overheat and cause a fire. Find the problem and fix it.
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Old 01-29-2021, 07:41 AM   #20
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I spent quite a while poking at things but I suspect that locating exactly where the short is may be beyond my depth. Iím currently thinking I may just attach a battery kill switch to turn off the power when not in use. Would like to get to the bottom of it though; if anyone knows a mechanic near San Francisco who is good with electrical triage, then Iíd take recommendations.

Did you do a lengthy battery disconnect to see if the problem persists?
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Old 01-29-2021, 04:04 PM   #21
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if anyone knows a mechanic near San Francisco who is good with electrical triage, then Iíd take recommendations.
Maybe here? Worth a call I think.

https://bayarearidersforum.com/forum...d.php?t=547857
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Old 01-29-2021, 05:26 PM   #22
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Heck, if something is making a whirring sound, you should be able to figure out what it is easily enough. Once you know what it is, you can the see what it's connected to and go from there.
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Old 01-29-2021, 05:30 PM   #23
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Oh, shit, sorry. Whirring noise, not purring noise. Never mind.
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Old 01-29-2021, 06:22 PM   #24
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Did you do a lengthy battery disconnect to see if the problem persists?
Yeah Iíve been disconnecting the battery overnight. No help.
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Old 01-29-2021, 06:26 PM   #25
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Heck, if something is making a whirring sound, you should be able to figure out what it is easily enough. Once you know what it is, you can the see what it's connected to and go from there.
I know for sure what the thing making the noise is - the idle air control motor. Iím not finding the ďsee whatís connected to it and go from thereĒ part to be easy. The system seems quite complicated to me.
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Old 01-29-2021, 10:18 PM   #26
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I know for sure what the thing making the noise is - the idle air control motor. Iím not finding the ďsee whatís connected to it and go from thereĒ part to be easy. The system seems quite complicated to me.
An electrical schematic should tell you easily. If you don't have one, get one. It's critical to analyzing electrical problems. Likely there's a relay or switch that controls it and that could be the problem.
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Old 01-30-2021, 01:28 AM   #27
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An electrical schematic should tell you easily. If you don't have one, get one. It's critical to analyzing electrical problems. Likely there's a relay or switch that controls it and that could be the problem.
^ 100% this.

Dealing with electrical issues is all about coming up with ways to isolate variables to identify the cause of the problem. You are already approaching this is a logical way you just need more information about the system your dealing with.

Knowing the path the electricity flows (wire color, connector / pin locations) from the component is invaluable information. Service manuals are invaluable references, I have one for every bike I have owned.

-----
Based on the fact that this started with a blown fuse makes me suspect that a relay or some other switching component has failed. Alternately before the fuse blew enough heat was generated to melt the insulation of some wire/s.

I found this, it's not for your bike but I suspect that the tests for resistance and voltage will transfer over...?
Ninja service manual

I found a number of posts on Kawi jetski forums that say that if the IAC is unplugged or defective your idle speed will be sporadic and throttle response is affected.

This is the sort of work that eats up mechanic hours as it's a lot of trial and error.
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Old 01-30-2021, 07:53 AM   #28
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Hopefully it doesn't come straight off the ECU.
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Old 01-30-2021, 11:27 AM   #29
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Hopefully it doesn't come straight off the ECU.
Likely not. I'm sure that there's a relay in between. My guess is either it's a stuck relay, or the ECU isn't shutting off the signal to the relay.
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Old 01-30-2021, 11:45 AM   #30
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Likely not. I'm sure that there's a relay in between. My guess is either it's a stuck relay, or the ECU isn't shutting off the signal to the relay.
When I look at the attached schematic I don't see anything but capacitors between the ECU (37) and the idle speed control unit (35). Moreover, 12v is also escaping the ECU in its CAN accessory cable (not in this schematic because I have an aftermarket ECU which adds that) and that did not happen before this problem started.

I've tested the diodes on the relay unit according to the manual, and strangely, the tests all have results opposite of what the manual says they should. Maybe that's the problem, but I'm skeptical. Every single test is opposite (that is, I get continuity with the probes reversed from what the manual says), and I feel like if all the relays were broken, the bike wouldn't run, and it *does* run, so it seems more likely to me that I'm misunderstanding the manual.
Attached Files
File Type: pdf schematic.pdf (150.9 KB, 19 views)
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