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Wiring an ammeter.


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#1 coinman66 OFFLINE  

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Posted November 18, 2015 - 01:05 PM

Got an ammeter with two terminals with nuts and a light bulb on it with a red and black wire. I have 2 wires coming into the ammeter, a black and a red. What is correct way to wire it up. The light bulb on the ammeter should only come on when headlight switch is turned on correct?

#2 chieffan OFFLINE  

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Posted November 18, 2015 - 01:46 PM

The light bulb needs to be wired into your light circuit.  The red from the amp gauge should go to the battery power source.  Probably the Bat terminal on the voltage regulator.  The black wire would  go to your ignition switch.  Hook it up that way and watch it when you turn the key to start the engine.  If the gauge reads to the negative side your in business.  If it reads positive, just switch the wires around on the gauge.


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#3 coinman66 OFFLINE  

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Posted November 18, 2015 - 01:57 PM

There are no wires coming from ammeter except for the tiny diameter light bulb wires which are black and red and only about 2 inches long. There are 2 wires black and red coming to the ammeter from wiring harness.

#4 coinman66 OFFLINE  

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Posted November 18, 2015 - 02:39 PM

Ok I think I got ammeter hooked up right cause when I turn key in on position without starting, needle points towards discharge. Now I've tried light bulb both ways wired to ammeter and both ways the light always stays on even with key in off posistion?

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#5 larrybl ONLINE  

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Posted November 18, 2015 - 03:32 PM

Light bulb black wire to chassis ground, Light bulb Red wire to the switched side of your light switch. (You may need to extend the red wire.)


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#6 Cvans ONLINE  

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Posted November 18, 2015 - 03:58 PM

:iagree:



#7 coinman66 OFFLINE  

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Posted November 18, 2015 - 04:24 PM

Ok here is light switch. So hook red wire on which side?
Thanks

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#8 crittersf1 OFFLINE  

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Posted November 18, 2015 - 04:41 PM

To the terminal that is HOT only when switch is on



#9 coinman66 OFFLINE  

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Posted November 18, 2015 - 04:51 PM

To the terminal that is HOT only when switch is on



Ok thanks!

#10 toppop52 ONLINE  

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Posted November 18, 2015 - 04:59 PM

I have never understood why ammeters were used for so long, a simple volt meter provides more useful info and is far safer than running full current through a gauge.

#11 ol' stonebreaker ONLINE  

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Posted November 18, 2015 - 05:54 PM

I have never understood why ammeters were used for so long, a simple volt meter provides more useful info and is far safer than running full current through a gauge.

Agreed!!

                     Mike



#12 larrybl ONLINE  

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Posted November 18, 2015 - 06:38 PM

I agree also, several times I have needed a volt meter to ascertain whether the battery was charging or not (or getting enough charge). The Amp meter can tell the same, just not as accurate with the low amperage output of a GT alternator. The Amp meter can contribute greatly with starting and charging issues as the high current is passed through them, and makes for additional points of connection failure or corrosion. A failed voltmeter will have no impact on the overall system.  






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