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I do have that J1939 connector. Just to be clear, when battery 2 is connected, it gives voltages on both engines. When battery 2 is out of the boat and thus not connected, it doesn't give any voltage reading on either engine.

The readings were taken from the plotter. Starboard battery switch set to number 1 battery while port battery switch set to number 2 battery. To confound matters even more, as you probably know, my Garmin 8612 plotter shows voltages for port engine and starboard engine, obviously not battery one...

I do connect shore power at the dock. As far as crossover, let's talk about the following example. Battery number 1 was reading low while underway. However, when I load tested the batteries it turned out battery 2 needed to be replaced. So, I replaced battery number 2. However, after replacing...

Once again, thanks for the help. I do have both a power assist pump and an autopilot pump. Although the power assist pump is wired directly to battery 2, there must be a sense wire somewhere because that pump only operates when the key is turned on, whether or not the engines are on. So, I am...

Thank you all for sticking with this thread. And, in response to Skunk's last post, since I only have two batteries, it should make no difference, I would think, which switch is connected to which battery. After my test run today, I have concluded that I likely have no problem of any...

The battery panel is labeled port and starboard. The plaque says that the"normal" position is the switch labeled starboard gets turned to position number 1. The port battery switch gets turned to position number 2. Why is that any more normal than if the battery switch labeled starboard gets...

Here is a brief update after speaking with the local Yamaha tech who services these engines. He said that the regulators do not usually go bad on these engines. So, a prophylactic changing of the starboard regulator appears not to be in order. Next question. The Grady White plate on the inside...

Thank you. Very helpful. If the starboard engine puts out 14 volts at the dock that's good. Since you indicate it is a smart alternator, is it then normal for it to kick in again underway when the load on the starboard battery has dropped to about 12.5 volts? In other words, is a drop from 14 to...

Well, subject to a test run tomorrow, I am tempted to just replace the regulator on the starboard engine. I am hoping it might be the regulator not properly charging the house battery. I am also hoping I do not have a stator or other wiring problem. With that said, these are 2012 Yamaha F300...

It was a wet cell battery.

How about a completely different possibility. What if the contacts on the starboard battery switch have some corrosion. They may not be letting a full charge into the house battery. I'll try to exercise the switch a bit and see if that makes a difference. Could that be a possibility?

As far as I know, I do not have an ACR. I have two battery switches not one. The starboard switch is set to battery 1 and the port is set to battery 2. As others have noted, battery 1 is the house battery. Not sure about the last question but at rest, with the switches in the above position...

Good to know. What I still do not understand is why after being underway for a few hours one stays at about 14 volts while the other (which is the newly added battery) drops to 12.4 before the regulator rectifier kicks in and bumps it up to 14 volts.

The charging voltage was 14.3 on both at the dock when the engines were first started.

I put a load on it.

No disrespect intended to Skunk. I am certain he knows a whole lot more than I do.

The voltage was checked at the battery to determine which was bad.

Here is the update. I replaced the port battery. That was the battery that was dropping too low when I used the tilt trim switch. The battery was two years old. I do not know why my plotter showed it as the starboard battery but it did. What is confusing to me is the following. In the course of...

I have only two batteries. The battery that is likely bad is the battery that drops when, on the throttles, I press the raise or lower all. That toggle is on the port handle.

My manual says battery 1 is the house bank. However, the manual does not specify which battery of the two is battery number 1. So, is battery number 1 the starboard or port battery. Just as an aside, the battery switches are labeled port and starboard. But, for some odd reason, at least in my...