Problem with #2 Battery Charging

[IW5469]

I have a 98 Evinrude Ficht 175hp.I've noticed the #2 battery loosing its charge under way. I will get an engine light because of the drop in voltage.When I use #1 I don't have this problem.<br /><br />I have replaced both batteries,and the battery switch. I still have the same problem. My #1 has all the electronics on it. My #2 battery has the load to the switch, the ground from the motor and a jumper ground wire to the #1 battery. I don't believe I have an Isolator. Both batteries are deep cell marine rv's. A buddy of mine has the same boat, motor, and batteries and does'nt have this problem.<br /><br />Questions:<br /><br />1- Should the battery read a little over 12 volts running at 3000 rpm's or higher?<br />2- When running the motor at 3-4000 rpms should the switch on the throttle that raises and lowers the motor drop the Voltage when you use it?<br />3- Do I need an Isolator?<br /><br />Any help with this would be great.<br /><br />Thanks,<br /><br />Mike S.

 

[marinemech]

Re: Problem with #2 Battery Charging

1. batery should read around 13.5 volts while running<br />2.trim switch will make voltmeter drop<br />your moter has a built in isolator<br />3. there is a terminal on the power distribution panel for connecting number two battery<br />if you run a number 12 wire from the terminal to the positive of battery 2 motor should charge it automatically

 

[IW5469]

Re: Problem with #2 Battery Charging

Thanks for the reply Marinemech.<br /><br />Both Bateries at Idol will charge at 14.5, but under way anything over 1500rpm's #1 will read a little below 12 volts and #2 will run the same, and then when I shut down and start up 2hrs later on #2 it will drain down below 8 volts when running above 1500rpm's,but not on #1. I have a feeling it will kill the #1 batery also.These bateries are only three weeks old.<br /><br />I've always had a problem with the #2 batery since I bought this boat three years ago. Last year I blew the power pack. I wonder if this problem caused that.

 

[marinemech]

Re: Problem with #2 Battery Charging

suspect rectifier regulator is culprit<br />very expensive part have someone with diagnostic software verify

 

[IW5469]

Re: Problem with #2 Battery Charging

I'll check it with the software. I know someone who has the program. I'm going to test the power relay after work and see if that checks out also.<br /><br />Thanks

 

[IW5469]

Re: Problem with #2 Battery Charging

It was the rectifier regulator. Everything is perfect now, motor is putting out more power than it did when I purchaced it 3 years ago. I suspect this was the problem from the begining. <br />Thanks for your help.<br /><br /><br />If the rect reg starts to go bad is it possible it can kill the power pack?

 

[marinemech]

Re: Problem with #2 Battery Charging

no power pack on your moter just an ecu <br />haven't heard of regulators killing ecu's but i guess anything is possible