Mercury 150 charging issues

[islandboy123]

Hello
u have twin 2012 mercury 4 stroke 150 motors. With 3 battery system with the vsr switch panel

1 battery for each motor and 1 house
i noticed my port and house battery was not showing high voltage. Both Was reading about 12.5 volts with a multi tester and sometimes lower when running.the starboard motor get over 14 volts when running .It seems to be getting a lil charge but not much. And it does no go higher like over 14 volts like my battery for the star board motor. So thought maybe the batteries are dying. But charge them at home and they get close to 14 volts fully charge. And also i put the star board motor wires on the port battery and it goes one time to over 14 volts when starting the motor. So I believe it could be then maybe the port alternator goin bad or not charging good ??
also I notice the port alternator getting very hot that I nearly touch it compared the starboard own where it is not that hot and I can touch it
so do you think I need to change the alternator?

also which motor charges the house battery? Does both motors change it or only be one ?
I would think only the port motor as it does not increase in voltage when turning on the motor. So just want know how does the Motors charge the house battery ,
thanks

 

[Blue_Sky]

Hello
u have twin 2012 mercury 4 stroke 150 motors. With 3 battery system with the vsr switch panel

1 battery for each motor and 1 house
i noticed my port and house battery was not showing high voltage. Both Was reading about 12.5 volts with a multi tester and sometimes lower when running.the starboard motor get over 14 volts when running .It seems to be getting a lil charge but not much. And it does no go higher like over 14 volts like my battery for the star board motor. So thought maybe the batteries are dying. But charge them at home and they get close to 14 volts fully charge. And also i put the star board motor wires on the port battery and it goes one time to over 14 volts when starting the motor. So I believe it could be then maybe the port alternator goin bad or not charging good ??
also I notice the port alternator getting very hot that I nearly touch it compared the starboard own where it is not that hot and I can touch it
so do you think I need to change the alternator?

also which motor charges the house battery? Does both motors change it or only be one ?
I would think only the port motor as it does not increase in voltage when turning on the motor. So just want know how does the Motors charge the house battery ,
thanks

Did you recently put them back in from storage? Curious how they are connected to the switch panel.. Is there 3 power leads going to the panel or just 2? Are any of the batteries parallel with each other which a positive cross over cable? Do both positive cables from each engine go to separate batteries?

edit: by switch panel you mean isolator ?

 

[islandboy123]

Did you recently put them back in from storage? Curious how they are connected to the switch panel.. Is there 3 power leads going to the panel or just 2? Are any of the batteries parallel with each other which a positive cross over cable? Do both positive cables from each engine go to separate batteries?

edit: by switch panel you mean isolator ?

hello no I always have them on the boat.
And have them charge with a on board charger .
please the pic of the back of my panel. I have 2 switches and 1 vsr.1 switch for both motors and 1 for house .
in the pic on left with circles is the wires from the motors. And on the right the circle wire is from the house battery. Let me know ur thoughts on my issue

 

[islandboy123]

hello no I always have them on the boat.
And have them charge with a on board charger .
please the pic of the back of my panel. I have 2 switches and 1 vsr.1 switch for both motors and 1 for house .
in the pic on left with circles is the wires from the motors. And on the right the circle wire is from the house battery. Let me know ur thoughts on my issue

 

[Blue_Sky]

What is the heavy gauge wire circled in green green hooked to, is that going to a breaker? and also which battery is the wire I have highlighted with blue going to? I can tell already this is one of those things I could figure out in about 5 minutes if I was standing there with a meter but through here it may be a challenge... Are those Blue Sea 4 position switches? Do you leave the switch in parallel, which probably says "emergency only"? That would be the way you'd need to leave it with the way it looks, other ways one battery is going to be turned off from the isolator by the looks of it. I'll try and decipher this a bit more, I need to eat dinner first lol..
View attachment 25991

 

[Blue_Sky]

What is the heavy gauge wire circled in green green hooked to, is that going to a breaker? and also which battery is the wire I have highlighted with blue going to? I can tell already this is one of those things I could figure out in about 5 minutes if I was standing there with a meter but through here it may be a challenge... Are those Blue Sea 4 position switches? Do you leave the switch in parallel, which probably says "emergency only"? That would be the way you'd need to leave it with the way it looks, other ways one battery is going to be turned off from the isolator by the looks of it. I'll try and decipher this a bit more, I need to eat dinner first lol..

View attachment 25991