Re: Ammeter???

Posted by John T on June 22, 2021 at 05:54:40 from (45.16.200.171):

In Reply to: Ammeter??? posted by db0941 on June 21, 2021 at 16:59:05:

Good question So my question is before I install the new alternator how do I (re)install a new ammeter? To what do I connect the positive
and negative to?

NOTE 1 Since it has an Alternator Im assuming its now NEG Ground NOT POS Ground as some old tractors were !!!!!!!!!!!
NOTE 2 Since many (cant say all) Ammeters are labeled for a NEG Ground, their + is the SUPPLY INPUT (to UNgrounded + battery post) while
the - is the LOAD OUTPUT (to Alternator and loads like lights and ignition)

HOWEVER I CANT GUARANTEE THAT so if you wire it up and it reads bass ackwards simply reverse its terminals

IFFFFFFFF its wired correct if you turn on lights or ignition etc not running it should swing over to - discharge but + charge when
running if alls correct.......If it does the opposite simply reverse the leads

1) To measure the current (other then starter motor) flowing INTO (Charging) the battery and that flowing OUT (Discharging) it needs to be
wired BETWEEN THE BATERY AND ALTERNATOR with Loads (Lights, Ignition etc) also on the Alternator side.

2) To do that the SUPPLY INPUT ammeter terminal connects to the UNgrounded battery post often (but not necessarily) via where the big
battery cable wires to the INPUT BATTERY side of a starter switch or solenoid,,,,,,,,,,,,The ammeters other LOAD OUTPUT terminal wires to
the Alternators big main output stud/post

EASY PEASEY SUPPLY side of ammeter to UNgrounded battery post (or a terminal connected thereto like at starter switch input),,,,,,LOAD
side of ammeter to Alternators big output stud/post along with other loads like lights and igniton etc

3) Does it need a new ammeter??? maybe the old one is okay as it measures current flow NOT if the tractor is 6 or 12 volts. An old ammeter
may only be a 20 or 3 amp while an alternator may pump 40 to 60 or more amps so an old may not be best way to go !!!!!!!

4) Most alternators require NEG Ground, typically an ammeter is labeled for NEG ground vehicle....IF THATS THE CASE AND BOTH ARE TRUE
??????????? But I cant know that for sure Im ONLY assuming that but if not its easy to swap wires

THE AMMETERS + IS THE SUPPLY INPUT SIDE (wires to battery or to a terminal connected thereto) if my assumption is correct ??
THE AMMETERS - IS THE LOAD OUTPUT SIDE (wires to alternators big output stuc/post)

You DID NOT ask about a Voltmeter but it wires across the battery + to + and - to - EASY PEASEY two wires PLUS switched so its ONLY
connected when tractor running.. Switched so its not working when tractor isnt running

You DID NOT ask, but an Ammeter measures current flow into (charging) or out of (discharging) the battery
a Voltmeter measure battery voltage

Not being there I cant say for sure this is correct BUT REMEMBER the above is for a NEG ground tractor and assumes (maybe yes maybe not)
the ammeter is labeled for typical NEG ground vehicles such that + connects to battery and - to alternator IF NOT REVERSE LEADS

John T

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