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Old 08-14-2015, 05:18 AM   #1
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After market ammeter intallation recommendation.

I'm interested in installing an ammeter but I'm not happy with the results of my web search. Yes, I can fine meters and they're quite cheep but I'm having trouble with how they're wired. YouTube has some videos of setting them up on a work bench with little batteries and alligator clips but that's got me scratching my head. Plus they all seem to have potentiometers to adjust, how would I know it needs adjusted?

Anyway, if anyone knows of a meter that has nice instruction manual I'd sure be grateful.

Thanks,
Robby
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Old 08-14-2015, 07:32 AM   #2
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Installed volt amp and hertz meters
This is what I did to mine and it works great.


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Old 08-14-2015, 08:32 AM   #3
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Amp meters are of 3 general types.

Direct, clamp and shunt.

Direct is placing the meter in line with current flow and that requires a lot of wire, used in lawn mowers.

Clamp on is often used for ac units and some test equipment and units for DC require more complex design so more expensive and still not that good unless more expensive.

Shunt uses a resistor in the supply with a voltmeter reading the drop across it.

They work well and can be in ranges of less than 1 amp to 500.

Cheap ones only indicate one direction current and better ones both.

We got some off ebay for about 10 bucks that show both volts and amps to make battery monitors on a slow day and they only show load amps not charge.

For alternator use the shunt type would give best results but USE FUSES AT SHUNT FOR METER LEADS as both leads are at alternator potential.

Adjustment should not be needed unless you are real picky.

And that requires knowing the shunt value.

Most indicate x volts per y amps so a simple voltage measurement and some math gives you the number the meter should indicate.
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