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Short in wireing?

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-Savage-
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Joined: 10 Jun 2005
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PostPosted: 20:39 - 14 Aug 2009    Post subject: Short in wireing? Reply with quote

Hi all, my CBR600F has been having problems. Battery dies after riding/sitting for a while. It has a 2mA draw on the battery (tollerance 0.1mA) with ignition off, and all fuses removed.....

does anyone know what way to approach looking for the short?
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Timmeh
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PostPosted: 20:59 - 14 Aug 2009    Post subject: Reply with quote

All the fuses?

Including the main 30A one?

First job would be to take the battery off and see how fast it discharges with no load.

With all the fuses out the short should lie between the live side of the fuse box circuits and the battery, as all the other cables are now disconnected.

You could try sticking your multimeter between the pins of the fuse holder and the chassis earth, if one reading (multimeter set to resistance, 200 ohms scale) is widly different then you might have found your leak. Chances are its a bit of insulation thats rubbed off or gone porous.

HTH

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-Savage-
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PostPosted: 21:30 - 14 Aug 2009    Post subject: Reply with quote

Sorry yea main fuse still in.

Continuity on all fuse circuits apart from the fan.

Bear with me here, electrics are my weak point. Since the fuse isn't connected to earth, there must be a break in that wire and it must be between the fuse and the earth?

EDIT: wait the fuse is out, and there is still a draw on the battery, so the short must be between the fuse and the live, but how come there isn't continuity between the fuse and the earth? Is this because of the thermoswitch for the fan?

I tried disconnecting the fan but still had a draw on battery.

Its a fresh battery I put in as I originally though the battery died due to me leaving my heated grips on or something.

Heated grips and all other circuits are disconnected from the battery as well *
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finpos
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PostPosted: 10:30 - 15 Aug 2009    Post subject: Reply with quote

With all the fuses removed, you basically just need to follow cabling between the battery +ve terminal and the fusebox, if it's leaking it'll be somewhere along there. What you'll probably find the only other thing that the battery is connected to (apart from badly fitted accessories Smile ) is the starter relay. You might want to disconnect that see if the leak goes away - remember to disconnect the earth on the battery before doing that!

Yes, the thermal switch on the fan circuit will make it appear open.

But I agree with the above, you need to see if the battery is discharging on it's own - 2mA isn't a huge amount. Might be something like the ECU.

f.
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