Oil Pilot Light on F9.9 - AEM yr.1993

[Grahame Pryce]

I Wonder if anybody can assist with the above ( part no. 6G8-835282-00). This light assembly is supposed to light all the time when the engine is running indicating that the oil pressure is OK. I'm not sure if the bulb has just blown or there is a problem with the oil pressure. The engine is cooling ok and the oil/filter has just been changed.

A new oil pilot light assembly is about £50 - which seeems an lot of money for what basically is a bulb. Is there any way I can replace just the light or check the oil pressure is ok ? Any advice would be most appreciated.
Thanks Grahame

[rodbolt17]

its not a bulb, its an LED.
power is from the stator charge coil and the ground path is through the oil pressure switch.
easy to test with a digital multi meter but it is polarity sensitive.
its basically a light emitting diode.
wait that's what LED stands for.

[99yam40]

Is it the charge coil or is it the lighting coil that furnishes the power for the light?
Just thought you might have miss typed, but then some motors do not have the lighting coil so you were probably correct

[rodbolt17]

doesn't really matter much on the nomenclature here.
the point is its generated by the flywheel magnets and a coil.
means the engine is running.
typically on the fourstroke tiny mites the oil lamp only lights if the oil pressure is low.
the oil pressure switch controls the ground path.
however there have been changes and I only see US market stuff.

[boscoe99]

A brilliant idea really, having a warning light that is positioned behind the driver and in the opposite direction in which he is looking. So be it.

The light does illuminate when all is well. It goes off if there is a problem. Another brilliant engineering solution contrary to conventional methodology for caution and warning devices. Gotta love Yamaha. But I think the really small stuff is made by the French so that it explains it.

However, if there is an oil pressure problem the motor will go into RPM reduction mode and will run ruff. This should be a clue to the operator to turn around, view the warning light, and turn off the motor. Many just keep on driving until it gets very quiet.

The assembly is about $38 bucks here in the USA 6G8-83530-00-00 Yamaha Oil Pressure Light on Panel (Panel)

A T9.9AEM is the equivalent of a USA T9.9ELRS.

[boscoe99]

Is it the charge coil or is it the lighting coil that furnishes the power for the light?
Just thought you might have miss typed, but then some motors do not have the lighting coil so you were probably correct

Oddly enough, it appears to get its power from the CDI. First Yam I have come across with this configuration.Specification calls for 64 volts AC to the lamp. So, it comes from some coil but exactly which one I am not sure.

How can an LED work with 65 volts AC? Must be some gizmo stuff in the lamp module to rectify the voltage and then to lower it.

With any Yamaha it is best not to make any assumptions as to how it works. I have been burned many, many times.

[99yam40]

yea, even if the indicators were in front of the person running the boat, they would not look at the indicators unless something strange was happening so having them behind you would not make too much a difference.
This is why lights and buzzers are both used along with the reduced RPM.
And hopefully they work when needed