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Old 29-10-2024, 00:14   #16
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Re: 12V Battery voltages

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Originally Posted by coopec43 View Post
I have one good battery which has charged to 12.6V quite easily. Tomorrow I will load test it.

The other battery is obviously stuffed as I have been charging it for 5 hours and it is only registering 11.8V

Free[/I]"
12.6 v is not a full charge. You should see at least 14 v for several hours while charging and 12.7 to 12.9v at rest. How many amps is your charger? It may take 24 hrs to fully charge them.

Given the importance of starter batteries, they must always be replaced as a set. Otherwise, you'll be buying again in less than 12 months, and you just might end up paying for a tow as well.
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Old 29-10-2024, 09:08   #17
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Re: 12V Battery voltages

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Originally Posted by Mike Banks View Post
I suspect that the starter motor is spinning but the Bendix drive remains disengaged. It slides along a thread against a spring, and the thread needs to be lubricated. If it has not been lubricated for some time, this may be the cause.

You will need to remove the starter motor to do it, and while you have it out, you might as well check the motor brushes as well and replace them if worn.

If your batteries are two years old, they may be alright, but there is a chance that they are faulty and that is why they are simply not spinning the starter motor at sufficient speed to operate the Bendix drive. Terminal voltage is not the same as terminal voltage under load.

I replaced mine every two years anyway. An engine that will not start in an emergency is a potential loser of your vessel, and perhaps your life and that of any others aboard at the time.
What Mike Banks said. All the battery based responses are of value, but if uoure hearing whirring the solenoid is working, its the bendix gear that’s not sliding along the shaft to engage the flywheel gear. The starter removes with three bolts. Though tapping the housing may free it up, lubricant is definitely in order. Best would be some blaster or LPS1. The head of the starter is most likely grit or grunge laden.

Two batteries, one older with lower voltage, one newer with higher-the new one will be pulled down to the lower voltage. Clean all connections, wire brush, and reassemble , apply dielectric grease as preventive coverage.
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Old 29-10-2024, 09:59   #18
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Re: 12V Battery voltages

You may have one shorted battery cell. When charging, is one battery hot and the other not? The hot one is shorted.
Check the battery voltage with them disconnected from each other.
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Old 30-10-2024, 03:52   #19
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Re: 12V Battery voltages

Please, my friend. Replace both batteries. The little cost will be well spent.
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Old 30-10-2024, 19:12   #20
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Re: 12V Battery voltages

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Originally Posted by Zil View Post
Please, my friend. Replace both batteries. The little cost will be well spent.

Two batteries @ $350 is not "little cost" to me. (But thanks for your advice any way)
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Old 31-10-2024, 05:56   #21
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Re: 12V Battery voltages

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Originally Posted by leecea View Post
I saw some threads on other forums where unusually high voltage readings were due to low batteries in the multimeter itself. Perhaps try with fresh batteries or a second meter?
Good point.


Most DVMs [or DMMs] use 9V internal batteries. When these batteries drop below about 6 ➛ 7V, the DVM will, either, cease to function, or give false high voltage readings.
If a weak meter battery results in an internal reference voltage falling, this could cause the meter to read high.
However, the best DVMs, from reputable manufacturers, remain truthful, even when the battery is down to [as low as] ±6V, and fail to function [show a ‘low battery’ warning], below that.
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