My new digital dash meter reads low volts.


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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
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84 GL 1200 I

My new digital dash meter reads low volts.

Postby virgilmobile » Sun Jul 22, 2012 11:09 pm



To improve the looks and monitor the electrical system on my soldered up gl1200(viewtopic.php?f=16&t=12522),I installed a digital volt meter next to the new radio.

I know,I need a pretty bezel around it too,but back to the problem.
A DVM on the battery showed,while idling,13.8 volts...The dash meter showed12.6 volts....
I did a test of the voltage drop from the battery positive post to where I attached it in the faring ignition wire.Low and behold it measured 0.605 volts.
Hmmmm,that explains part of it.
I decided to measure to see if there was a voltage drop on the ground.
I attached the DVM to the battery ground and then to where I connected the meter and wa la...another 0.6 volt drop...

OK,I ran a pair of wires direct from the meter to the regulator.I attached them to the frame and the black regulator wire(which I have relay controlled) .

End result..The in dash volt meter now reads exactly what is on the battery. 13.6 volts at a idle and 14.3 at 3500 rpm. Charge rate at 4.2 amp to the battery



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dingdong
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Re: My new digital dash meter reads low volts.

Postby dingdong » Mon Jul 23, 2012 6:59 am

Way to go Virgil. Now get to work on that pretty bezel. ;)
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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WingAdmin
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Re: My new digital dash meter reads low volts.

Postby WingAdmin » Mon Jul 23, 2012 1:09 pm

I found a cheap LCD voltmeter that I tried to put on my 1100, but gave up - it would read 100% accurate when the bike was off, but as soon as the engine was started, it would read about 2 volts higher than what a DVM hooked up at the same place would read. I guess it was seeing noise from the rectifier/regulator and reading it as voltage.

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virgilmobile
Posts: 7653
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: My new digital dash meter reads low volts.

Postby virgilmobile » Mon Jul 23, 2012 1:32 pm

I'm sure this one would have too but I use a relay from the battery to switch the regulator on.that's where I tied in for the meter.




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