2010 F90TLR Yamaha Charging voltage

[KJINTF]

I noticed my volt meter reading high
After 10 minutes of about 4K rpm the meter reads 15 Volts
I have two separate volt meters the stock Yamaha dash meter and one I installed directly to the starting battery
Both meter read very close the same at high 14 Volts and as much as 15 Volts

What is the normal charging voltage I should expect from this engine?
How can I reduce it to say 14.4 Volts MAX

Thanks for the help

 

[KJINTF]

Re: 2010 F90TLR Yamaha Charging voltage

Anyone ever measure the battery voltage during operation of your Yamaha outnboards?
What voltage do you see?
Does it stay constant?

 

[Capt Ken]

Re: 2010 F90TLR Yamaha Charging voltage

I've seen them over 14 volts and that isn't that high when you remember that 13.7 is the ideal voltage. My diesel truck shows 14.5.

 

[KJINTF]

Re: 2010 F90TLR Yamaha Charging voltage

Hi Capt Ken

Thanks for the response

For me 15 Volts is high - it's just too high for my batteries

Any way for me to modify the Rectifier (aka Diode) regulator assembly to get 14.4 Volts?
I see the Yamaha manual says simply replace the regulator (yes I checked all their trouble shooting items) I am looking for a way to modify the max voltage.

Are you aware of any way to modify the electrical connections to make such a thing to happen?
Looking for the electrical schematic of the regulator assembly

Thanks for the help

 

[99yam40]

Re: 2010 F90TLR Yamaha Charging voltage

check battery voltage at the battery terminals with a good volt meter( not a cheapo) to make sure what the voltage is.

If voltage regulator is letting too high of a voltage out then replace it like the service manual says, no need to reinvent the wheel

 

[KJINTF]

Re: 2010 F90TLR Yamaha Charging voltage

And to top it all off
The official Yamaha manual for the F90 engine troubleshooting section clearly states
1 - Check the stator ac voltage at two different RPM's - My measured AC voltage are well within specifications
2 - Check the output of the regulator: Specification 13.00 Volts with no tolerance given so have to assume that unless it reads exactly 13.00 Volts the regulator is defective

Does anyone have a good regulator?



PS - Yes my measurements were taken at the battery with a high quality Fluke DMM

 

[Capt Ken]

Re: 2010 F90TLR Yamaha Charging voltage

Why not get it plugged into the Yamaha diagnostic system. It will show the true voltage and if its too high, it will show it as a fault and the voltage will be flagged red. If it doesn't show as a fault then don't worry about it.

 

[KJINTF]

Re: 2010 F90TLR Yamaha Charging voltage

Capt Ken

I did - I have ver 1.32 YDS here in the shop - it shows the very same 15 Volts, which is too high for my batteries
Sure wish I had ver 2.0 YDS - Can you help me out there?
No Fault indicated but that does not mean much since 15 Volts is too high IMHO
That voltage for any duration in 80 degree weather will KILL my batteries very quickly
Now if it was a proper system and had temperature compensation 15 Volts on cool / cold days would be just fine

FYI - I design Solar PV charging systems for RV's and have worked with Morningstar Solar on the design of a proper MPPT charging controller. Just trying to get the Yamaha to work properly

Looks like from the schematic that the ECM has control of a few of the stator wires - Is the voltage regulation controlled by the ECM with these connections or just the rectifier (aka Diode) / regulator assembly?

 

[Capt Ken]

Re: 2010 F90TLR Yamaha Charging voltage

You aren't using gel batteries are you?

 

[99yam40]

Re: 2010 F90TLR Yamaha Charging voltage

And to top it all off
The official Yamaha manual for the F90 engine troubleshooting section clearly states
1 - Check the stator ac voltage at two different RPM's - My measured AC voltage are well within specifications
2 - Check the output of the regulator: Specification 13.00 Volts with no tolerance given so have to assume that unless it reads exactly 13.00 Volts the regulator is defective

PS - Yes my measurements were taken at the battery with a high quality Fluke DMM

Not sure what manual you have for your motor(aftermarket or Yamaha), but the Yamaha manual for my C40TLRX gives specs in peak voltage not ac voltage. No your fluke peak reading meter will not do the job unless it is made for these systems.
Need special meter or a DVA adapter with regular meter set on DC.
And the specs are given as minimum for most coil voltage reading

 

[Capt Ken]

Re: 2010 F90TLR Yamaha Charging voltage

1.32 is the first issue. 1.33 is the second issue that I'm currently using. I'll probably update to the 2.0 this year but $1200 is a chunk of change.

 

[KJINTF]

Re: 2010 F90TLR Yamaha Charging voltage

Capt ken

No no Gel batteries - However I would very much like to use AGM's
Heard from a Yamaha Tech that Yamaha "clearly" (where I am not sure and have not been able to find it anywhere) states NO AGM batteries no Maintenance free batteries and no wing nuts on the batteries. Additionally the charging system is a crudly simple and not very accurate 3 phase stator, full wave rectification, and a regulator that simply dumps the excess. The reading of 15 Volts is not uncommon with such a poor voltage tolerance systems. Reminded hiim of the 1950's auto regulators with mechanical regulators.

I for one would be happy to spend a few more $$$ on a proper multistage ECM controlled charging system however have to assume most folks do not care.

Thanks for the note on the YDS - I have both 1.32 and 1.33 and looking for 2.0. Version 1.x is really crude (looks like windows 3.1 or even dos based at best) hoping ver 2.x is a bit better. I have the factory Chrysler DRBIII tool, the GM factory tool plus a few opthers. Sure they cost $$ but they are nice toys to have in the shop


99yam44

I have the official Yamaha F90 shop manual and was referencing the troubling shooting section toward the end of the manual. I also have more than a dozen VERY high quality DMM, ESR and High Voltage meters and do indeed know have to take voltage current and resistance measurements. I was making the statement that the manual says 13.0 volts as the regulator output with no +/- tolerance

 

[99yam40]

Re: 2010 F90TLR Yamaha Charging voltage

Just trying to let you know that manuals I have seen show
Charging System Peak Voltage readings at cranking, 1500 & 3500 rpm are listed as minimum with no +or- and say to set meter on DC

A fluke 87 or others with peak reading capability are not the same type of meter ( unless you have one of the ones made for these outboard motor systems)as what they are talking about using and require a DVA adapter to get reading to compare to specs in manual otherwise you are not comparing apples to apples.

 

[Capt Ken]

Re: 2010 F90TLR Yamaha Charging voltage

I believe Yamaha is going to keep the new 2.2 out of the publics hands for as long as they can. Not only is it costly but the dealership has to pay and register each module. That is the brains of the system. You can load the program on as many laptops as you want but they are no good without the module.