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Voltage Issue

Old 04-29-2003, 05:57 PM
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Gents -

My new Furuno LS6100 has a voltage indicator on it. I turned the feature on just so I could monitor it. I have noticed, however, that, at high speeds the voltage gets up over 16.5 or 17.0 volts (once it hits 17.5 volts the system turns itself off on purpose). Is there something irregular in my wiring scheme possibly? Where can I start looking to debug the problem? Thanks as always!

BuckTales
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Old 04-29-2003, 06:47 PM
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Start with your Voltage Regulator. It isn't working and you are probably overcharging your batteries too.
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Old 04-29-2003, 07:11 PM
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Nightfisher's probably right, but I'd want to verify that voltage before I went too far. Hook up a temporary volt meter or multimeter and take your boat out for a spin so you can duplicate the voltage shown on your Furuno. If the temporary meter reads the same, have your engine mechanic source the problem before you burn something up. Puttin out 17+ volts, your boat should be glowing.
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Old 04-29-2003, 07:25 PM
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What would be the top end output? Mine reads 14.6 That in line?

Thanks
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Old 04-29-2003, 07:51 PM
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13.8 Volts is ideal. The 14.6 Volts you have is on the high side but you probably won't damage anything with it.
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Old 04-29-2003, 08:16 PM
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Not to bring up the whole battery switch setup discussion again.... but I do have the:

* 2 engines
* 2 batteries
* 1 switch

setup; with both engines going into the single hot output of the switch.

Could that be whats effecting this?

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Old 04-30-2003, 01:58 AM
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Dont hook the output of 2 alternators together. They are not designed to do that.

The result is what you are getting, loss of regulation. With the added risk of the loss of alternators.
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Old 04-30-2003, 04:54 AM
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Default Voltage Issue

I had the same problem, got a quality digital voltmeter and checked the voltage at the batteries, bother were well within normal ranges.

I called Furuno and was advised that it is probably just misreading and also that it should shut down of it read 17V.

I am sending you a PM with my work email address, I am going to send mine back for a replacement and think you should do the same. I would like to reference your situation as well.

Good luck,

Roop

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Old 04-30-2003, 08:22 AM
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The first thing that you MUST do is get TWO battery switches, one for each engine. Until you do that, you are saddled with both alternators feeding a common node which connects to Bat 1, Bat 2 or Both, depending on the switch selection.

I would also have someone take a good look at the grounding arrangement of your 2 batteries, both engines and the ground wire that feeds your electronics. If this ground wiring is poorly done, it is possible that a small portion of voltage output from one engine alternator is, in fact, adding to the voltage output of the other engine alternator. This all happens through improper grounding, and could produce voltages as high as 20 volts to your electronics.
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Old 04-30-2003, 05:36 PM
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Gil & SeaDad - thanks. I am going to install a 2nd switch on Sunday.

Roop - after I install the new switch, I'll give it a test run and let you know what happens. My email is matthew.buckleman@digitalstandard.net if you wanna get in touch. Good luck with your situation!

Thanks again all.

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Old 05-01-2003, 06:37 AM
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Thanks again for all the help guys. I have just one more question. Am I correct in assuming that it doesn't matter which switch I hook up the house panel to (from the center console)? I'll have 2 switches now (one for each engine); but I really don't have any place to put a 3rd one.

Thanks!

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Old 05-01-2003, 10:58 AM
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preferably the house wiring would end up at a dual purpose cranking/deep cycle battery.

Dont forget to wire the bilge pump directly to the battery, and not through a switch.
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Old 05-02-2003, 08:11 AM
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Thanks SeaDad. How about without adding another battery or switch (room is an issue). I suppose just pick a switch?

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Old 05-02-2003, 11:13 AM
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yup.
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