CG125 fuel gauge

[Silver_Fox]

Is this the only vehicle in the world with a gauge that registers with the ignition off/keys out? I'm not too convinced on it anyway as I'm pretty certain it went from Full/Full/Full then suddenly to 2/3rds while out and about. It's a 2008 ES7 or 8 disc brake model
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CBR600 F3 FV
CG125

[RhynoCZ]

Try to disconnect the battery.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Silver_Fox]

What's the theory, static charge?
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CBR600 F3 FV
CG125

[RhynoCZ]

Faulty ignition switch and/or short circuit to the gauge, as it is a voltmeter after all.

You could check draw at the battery with the ignition switch OFF.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Silver_Fox]

Excuse my ignorance, but what should I be looking for?
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CBR600 F3 FV
CG125

[RhynoCZ]

Disconnect the battery, if it still does the same thing, then it's not broken, it's a feature.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Silver_Fox]

[RhynoCZ]

The last thing that could cause this, would be sticking needle of the gauge. That would be due to moisture in the housing of the gauge. But still, it shouldn't show a thing when there's no power.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Silver_Fox]

[RhynoCZ]

The sticking needle only applies, if you've got a analogue gauge, of course. I'm not sure if it wasn't equipped with a LED or LCD kind of gauge.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Silver_Fox]

Analogue. The only thing electric is the performance






































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CBR600 F3 FV
CG125

[Keir]

the fuel gauge works with the ignition off. its for a rough idea only, thats why you have a reserve tap.
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Current : '08 Yamaha FZ1s
Previous: '99 Honda CBR 600FX, 03 ZX636 B1H, 99 Fazer 600 (red), 02 GSX-R 600 K2, 00 SV650s (red), 2008 ZX10R, 97 Bandit 1200N, 04 ZX6RR K1H, 04 GSX-R 1000, 98 Fazer 600 (gold), 05 Madness 110 Pit bike, 04 CR125R, 00 SV650s (black), 06 KTM 625 SMC, 99 SRAD 600 track bike, 03 SV650, 98 Bandit 1200N, Bandit 600SY, 03 GSX-R 600 K3, 01 GSX-R 600, 01 Fazer 600 (black), VFR 400 NC30 x3, 78 Honda Dream, 00 Speedfight 50

[mauzo]

The fuel gauge keeps its position with the ignition off. I think this is usual with real needle-type gauges (rather than nasty fake LCD ones)? Certainly I've driven cars that did that before. It's not powered when the ignition's off, so when you fill up the needle doesn't move until you turn it back on.

Those divisions on the scale aren't thirds, they're (roughly) quarters, not counting reserve. From full to three-quarters the needle stays jammed up at the 'full' end. So having it suddenly drop down to the first mark (half) having not moved at all before that is usual. (The slop in the needle from accelerating/braking or uphill/downhill is about a whole division in any case.)
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'04 CG125, '07 CBF500