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1995 200hp Johnsons Overcharging?

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Good evening. I have twin 200hp Johnson Ocean Pros on my 1995 Grady White 272. In the beginning of the season I noticed low voltage from my house battery (electronics) with the engines off. When running my GPS would should about 12.5v - 13v. Even after being on the charger at the dock there was no change in the problem. I replaced the house battery with a marine deep cycle/starting battery that I had bought for my camper but, was not using. Since adding it I now notice that the entire system is overcharging. I am showing 15v - 16v on both engine battery voltmeters and roughly the same on the reading from my GPS (house battery). I have also been blowing the fuse for my spreader lights (unknown if related). At idle voltage on the GPS seems to be around 13. I did not notice what it was on the engine voltmeters at idle. Without the motors running voltage to the GPS shows as about 11v. Again, the house battery is new.

Any help on trying to troubleshoot this problem would be appreciated.

Thanks!
 
You dont say if/how the outputs from the engines are combined and split between the batteries.

15 to 16 volts indicates that one ( both???) may have a defective rectifier regulator ( or a bad connection ???)

Perhaps run the engines individually to see if you can tie it down to one or the other.

It may be worth looking at the CDI electronics troubleshooting guide http://www.cdielectronics.com/support/
 
As vics stated we would need to know more about the wiring on the batteries....but for trouble shooting purposes i would wire a battery to each motor with no connection between them and nothing but the motor connected...hook the gps to one of them and see what you have on voltage..write the reading down...one reading without the motor running and one with the engine at 3k rpm ..then swap the gps to the other engine and do the same...then get back to us please..do you have a multi meter and know how to use it?
 
vics said:
You dont say if/how the outputs from the engines are combined and split between the batteries.

15 to 16 volts indicates that one ( both???) may have a defective rectifier regulator ( or a bad connection ???)

Perhaps run the engines individually to see if you can tie it down to one or the other.

It may be worth looking at the CDI electronics troubleshooting guide http://www.cdielectronics.com/support/
Click to expand...

Thanks! There are 3 batteries each with their own PERKO switch. The two motor starting batteries have a 4 position switch (OFF, 1, 2, BOTH). The house battery has an OFF/ON switch only. As I recall I believe both motor batteries were in the BOTH position. This is not how I normally run them. I believe the house battery only charges from my starboard motor but, I will need to confirm that. Next time I am there I will isolate them and take readings at each battery with a meter. I can't see the likelihood of both regulators being bad at the same time.
 
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