Charge voltage from Yamaha outboards

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Lady of the Lake
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Charge voltage from Yamaha outboards

Postby Lady of the Lake » Thu Dec 05, 2013 4:24 pm

OK so I installed two new Yamahas in Lady of the Lake and everything is good with one exception. One motor is putting out around 15V to the battery and the other only half that, around 7.5V. Each motor is connected to a dedicated starting battery. Any ideas what might be wrong with the motor only putting out half the proper voltage? Anything I can easily check?

Thanks,
Sam
Sam and Gina Densler
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amytom
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Re: Charge voltage from Yamaha outboards

Postby amytom » Fri Dec 06, 2013 7:40 am

Are these the new style engines or just new to you?

If the old style I would check the voltage coming directly off the coil, if that's good then the regulator is where I'd lean. (Let me know if you need a coil or regulator)

If new engines let the dealer worry about them.

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Re: Charge voltage from Yamaha outboards

Postby Lady of the Lake » Fri Dec 06, 2013 2:58 pm

OK, major embarrassment here...always check the battery before assuming the motor has an issue :-)

Battery experienced a premature death, new battery is working fine, engine is charging at proper voltage, my bad.

Sam
Sam and Gina Densler
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PDQ36 Hull #15
Punta Gorda, FL

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Re: Charge voltage from Yamaha outboards

Postby thinwater » Fri Dec 06, 2013 9:57 pm

... Perhaps because of the charging arangment.

You will be MUCH happier with a single bank. Outboards don't need separate starting batteries.
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Re: Charge voltage from Yamaha outboards

Postby Lady of the Lake » Sat Dec 07, 2013 12:19 am

I can see your point. Have always had them separated in case I had a battery issue and needed to start the engines but I guess that is what pull start is for :-)

Sam
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PDQ36 Hull #15
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Re: Charge voltage from Yamaha outboards

Postby thinwater » Sun Dec 08, 2013 12:14 am

It's more than that. Depending on how they are wired, you are most likely not charging or using them evenly. Throw a stitch wrong and you ruin a battery.

This may not be the time, but when you are ready for replacement I would think seriously about a little re-wiring and installing all matching batteries in one bank.

The truth is, if you want the batteries to last you will never draw them much below half, and it takes very little to start one engine. There are also warnings that the batteries are getting low, even if you ignore the gauges; the autopilot will stop and the inverter will stop. Even if they are completely dead and you have to pull start an engine, you only have to pull start one; the other will provide enough power within 10 minutes to start the other.

(When I bough my boat the PO pitted me with ruined batteries for 100 mile trip home.)
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