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Value of Ammeters and Voltmeters

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Bill Darte

03-31-2005 11:06:26

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About to replace the gauges on my MF135.
Have heard a bit about the value or lack of value of ammeters, which mine has....some say volt meters are more useful.... I guess I don't understand either of them, because I don't see what value either provide.
What are the diagnostic values of each?

Also, can one safely replace the OEM units with regular automotive gauges? Sunpro or Autometer?

Oh, and I was worrying desperately over replacing the boot on my hydraulic master control spring...well, I finally tackled it last night. 10 minutes tops.... drove out the pin and unscrewed the clevis... it was completely free... It must have been worked on recently, though I have been loading it with penetrant since I got it....

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Gerald J.

04-01-2005 20:16:26

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Re: Value of Ammeters and Voltmeters in reply to Bill Darte, 03-31-2005 11:06:26

Been there, tried both together once. I see the typical automotive voltmeter as useless. The voltage change is too small for a meter with only one division per volt ( two marks, one at 8 and the other 18 as in my Ford F-150).

You can use automotive ammeter but you need to look for a 30 amp instead of a 60 amp.

The ammeter shows energy into or out of the battery. When the voltage regulator does its job and holds a constant voltage the battery takes most current when discharged and gently tapers to zero current when fully charged.

Gerald J.

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phil(va)

04-01-2005 14:52:14

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Re: Value of Ammeters and Voltmeters in reply to Bill Darte, 03-31-2005 11:06:26

I'm not an automotive electrician, but the simplest way I visualize it is the ammeter measures the rate of charge by the generator / alternator (and voltage regulator). The voltmeter, hooked between the battery posts, shows the state of the charge on the battery. Both can be valuable at times. Generally the ammeter is handy on the tractor and if you have a problem, hook up a voltmeter to help you diagnose it.

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txgrn

04-03-2005 08:36:54

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Re: Value of Ammeters and Voltmeters in reply to phil(va), 04-01-2005 14:52:14

I agree. Ammeter really tells you what you want to know, and that is that you are replacing the energy in your battery that you just removed for some reason.

I buy my gauges at NAPA. Stewart Warner 2" chrome bezel with black background and white lettering are very nice.

Mark

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Bill Darte

04-04-2005 05:08:51

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Re: Value of Ammeters and Voltmeters in reply to txgrn, 04-03-2005 08:36:54

Playing devil's advocate...
If a voltmeter reads proper, one can assume that the battery as been/is being charged properly, right?

I guess along those lines, if the tractor starts each and every time, there is no need for gauges at all.

Thanks to all for the perspective.

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