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Boat Voltage Issue

Old 07-11-2020, 03:29 PM
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Default Boat Voltage Issue

I have 3 batteries (2engine 1 house) and noticed that my engines batteries are displaying 14+ volts and the Simrad will show in the 8V range. Recently The simrad sometimes automatically shut off and so will the radio. If I shut off the engines and restart, the voltage on the simrad will show in the 12V range again.
I charged the batteries to full again not long ago. I’m not sure what the reason is or where to start looking.
Old 07-11-2020, 03:42 PM
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make sure your electrical connections are Clean, Bright and Tight.
Old 07-11-2020, 03:48 PM
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since you have separate house and cranking batteries,
there must be some arrangement to get electric from the engine(s)
to the house battery/load:
isolator, voltage sensitive relay, Auxiliary charing leads.

While not a common problem,
seems like that device may be malfunctioning.
But you need to do some exploring/investigating
to find out exactly what you have.
Old 07-11-2020, 04:01 PM
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Originally Posted by kev-n-tim View Post
make sure your electrical connections are Clean, Bright and Tight.
i did check they are clean and tight.

Originally Posted by Fwpratt View Post
since you have separate house and cranking batteries,
there must be some arrangement to get electric from the engine(s)
to the house battery/load:
isolator, voltage sensitive relay, Auxiliary charing leads.

While not a common problem,
seems like that device may be malfunctioning.
But you need to do some exploring/investigating
to find out exactly what you have.
it is a battery box with 3 key switches and some breakers. I’ve noticed are the occasional voltage drop on simrad display but engine batteries always show 14.4v
Old 07-11-2020, 04:02 PM
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Originally Posted by reeferog View Post
I have 3 batteries (2engine 1 house) and noticed that my engines batteries are displaying 14+ volts and the Simrad will show in the 8V range. Recently The simrad sometimes automatically shut off and so will the radio. If I shut off the engines and restart, the voltage on the simrad will show in the 12V range again.
I charged the batteries to full again not long ago. I’m not sure what the reason is or where to start looking.
How old is the battery system? What parts does it consist of? Do you have a multimeter?
Old 07-11-2020, 04:07 PM
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Originally Posted by Flying_Norseman View Post
How old is the battery system? What parts does it consist of? Do you have a multimeter?
batteries are just over year old. I have a multimeter. The box consist of 3 solenoids for each switch and a parallel switch too.
Old 07-11-2020, 04:18 PM
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Originally Posted by reeferog View Post
batteries are just over year old. I have a multimeter. The box consist of 3 solenoids for each switch and a parallel switch too.
No ACR?

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