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What you want to do will work. Just not as intended.

With the lithium battery keeping the non lithium Combiner on all the time it will be as if you have one big battery. Hybrid battery consisting...

The language is confusing. Even incorrect IMO. See my comments above.

Consider this. Motor not running. Two batteries with a Combiner attached to them. One battery (lead acid) at say 12.7 volts...

Yamaha EFI four strokes don't have manual adjustable mixture controls. A computer does it.

The Combiner is simply an automatically controlled switch. Does automatically what one could do manually.

DC to DC chargers consume some power on their own and can limit the amount of current flow...

It does not care which battery is lithium. When the voltage on either battery lead is X or above it parallels the two batteries. When the voltage is below X it disconnects the two batteries.

You...

The higher resting voltage of a lithium battery will fool the Combiner into thinking the motor is running. The Combiner sees that higher voltage as alternator voltage. The Combiner will parallel the...

Suspect it is an F200LB.

Trim it up as far as it will go. Loosen the valve on the trim and tilt unit while holding the motor up. Then grab the lower unit and manually raise the motor to the full...

Do you know why that is?

If you are testing to see if the pump is operable I would apply a battery positive and ground directly to the electrical leads to the pump. Positive to the male bullet connector on the brown wire and...

When conditions are right the ECU will apply a ground to the oil pump to cause it to turn on.

Power does not go to the oil pump via the manual override switch. Power goes to the oil pump via the key switch. When the toggle switch is pressed a ground is applied to the pump making it run.
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What are his qualifications?

14 and some odd volts when on a charger, or the motor is being run, seems normal. That is charger or alternator output voltage being seen.

12.6 - 12.7 volts does not seem abnormally low IMO. Key...

Yes

If a charger did not turn itself off I presume the BMS will disconnect the battery from the charger at some point. Will the BMS reconnect the battery automatically at some point in time or would the...

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MMM. Motor Models Matter.

Apparently so much so that owners are loathe to disclose them. Guarding them religiously.

It is across all brands. Not just Mercury.

What are they trying to to hide?

From the Yamaha USA website www.yamahaoutboards.com

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Your option. Charge or not.

Good to hear. Thanks for the feedback.

Suggest not to yell.

Which can be clearly seen if one has an app that displays charge current or if one has a clamp on ammeter.

I seriously doubt that is what Yamaha said.

Yamaha says to keep the oil level between the min line and the max line.

In your case several ways to get there. Drain all of the oil and refill. Or...

From a charger standpoint I would say yes.

From a battery standpoint it is a do not exceed number.

This battery charging stuff is madness IMO. On the one hand they say a lithium battery is...

It takes voltage to push amps. The higher the voltage the greater the amps. Within reason of course.