Gpz900 oil warning light issue

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Gpz900 oil warning light issue

Postby grytvikken » Mon Dec 09, 2019 8:07 am

Hi all I have been slowly putting my old 88 modell gpz back on the road and have everything done except for one thing. Im having a problem with the oil warning light obn the dash, it stays on constantly. Oil level is good but even if I pull the wire off the the sender the light on the dash stays on. Im not that graet at electrics so go easy on me if you have any ideas....think ....''Bike Electrics for Dummies''. I tried rerouting a new wire from the sender up to the plug at the dash to bypass any issues but the light goes out and stays out, not want you want. I have pulled the sensor cleaned it up and its working ok i tested it with my basic multimeter and it seems to be good. I am assuming the light on the dash would go out before start with ignition on f the wire at the sender was disconnected as this would simulate the switch shutting off once oil pressure had been achieved, is this the case?
I have replaced the starter clutch repainted what needed doing and sorted everything else out but this and its really frustrating....any opinions?
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Re: Gpz900 oil warning light issue

Postby BrettZZR » Mon Dec 09, 2019 2:58 pm

Generally the oil pressure switch supplies the 'earth'. So your circuit is shorted to earth somewhere where after the light and before the switch. Start at the light and follow the wires till you find it?
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Re: Gpz900 oil warning light issue

Postby grytvikken » Mon Dec 09, 2019 10:46 pm

Any ideas how i could bypass it
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Re: Gpz900 oil warning light issue

Postby BrettZZR » Tue Dec 10, 2019 12:55 pm

You don't want to bypass the switch - you say it's working?
Find the wire coming from the oil light, and...

See pic...

This diag is from an early ZZR - you *may* find the wire colour (Blue with red line) is even the same.
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Re: Gpz900 oil warning light issue

Postby bonester » Tue Dec 10, 2019 5:26 pm

Where in QLD are you? Might be able to help. I have an 88 as well. :)
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Re: Gpz900 oil warning light issue

Postby grytvikken » Tue Dec 10, 2019 10:43 pm

BrettZZR wrote:You don't want to bypass the switch - you say it's working?
Find the wire coming from the oil light, and...

See pic...

This diag is from an early ZZR - you *may* find the wire colour (Blue with red line) is even the same.


When I say bypass I mean the bypassing the dodgy wiring , i still want the light to work as designed
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Re: Gpz900 oil warning light issue

Postby grytvikken » Tue Dec 10, 2019 10:45 pm

bonester wrote:Where in QLD are you? Might be able to help. I have an 88 as well. :)


Im in northern brisbane mate , the bikes not registered at the moment it was sitting in a shed for many years and i thought it was time to get it running again
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Re: Gpz900 oil warning light issue

Postby BrettZZR » Wed Dec 11, 2019 4:41 pm

grytvikken wrote:... When I say bypass ...

Then do as per drawing. Don't forget to cut the dodgy wire out of the circuit (black crosses).
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Re: Gpz900 oil warning light issue

Postby grytvikken » Sat Dec 14, 2019 10:35 am

BrettZZR wrote:
grytvikken wrote:... When I say bypass ...

Then do as per drawing. Don't forget to cut the dodgy wire out of the circuit (black crosses).



Sorry for the late response been full on with work ...I have tried your idea and it doesn;t help im afraid. light goes out totally and stays out. thanks for your idea though.
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Re: Gpz900 oil warning light issue

Postby bonester » Sat Dec 14, 2019 4:17 pm

Are you sure the correct bulbs are plugged into the correct sockets in the dash???
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Re: Gpz900 oil warning light issue

Postby grytvikken » Sat Dec 14, 2019 10:08 pm

bonester wrote:Are you sure the correct bulbs are plugged into the correct sockets in the dash???

Yeah mate already checked that......im starting to think it needs a witch dr
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Re: Gpz900 oil warning light issue

Postby BrettZZR » Sun Dec 15, 2019 1:44 pm

Trace the voltage step by step... You *have* to find the problem.

(-8

EDIT: Typo removed...
Last edited by BrettZZR on Fri Dec 20, 2019 1:00 pm, edited 1 time in total.
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Re: Gpz900 oil warning light issue

Postby Gosling1 » Thu Dec 19, 2019 2:04 pm

grytvikken wrote: ...I have tried your idea and it doesn;t help im afraid. light goes out totally and stays out. thanks for your idea though.


are you saying the light goes out once the motor is running?
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