Posted by John T on March 01, 2009 at 04:40:45 from (71.55.26.69):
In Reply to: Farmall H alternator posted by narrowfarm on February 28, 2009 at 20:01:56:
One way to tell if the alternator or generator is working is to place a voltmeter on the battery and when shes not running a good battery should read around 12.6 volts. Then when running at decent RPM if all is wired correct n the genny or alternator is working, THE BATTERY VOLTAGE SHOULD RISE to at least 13 to 14 or 14.5 volts or more depending on alternator and battery and RPM etc. Also the lights should glow noticeably brighter at slow idle versus fast RPM if the charging system works.
Regardless if a genny or alternator, the ammeters SUPPLY terminal usually just has one wire, thats the one to the battery often via a wire to the starter switch/solenoid where the big battery cable atatches. Its other LOAD terminal wires to the alternators big main output stud/post of a BAT terminal on a Voltage Regulator or Cutout Relay PLUS feeds hot batteyr voltage to loads like lights n ignition via their switches..
A pertronix elec switch or points ignition would still draw approximately the same current given the same coil cuz the coil is the load and the switch (points or elec) is simpy the On/Off current switch.
Many alternator set ups cause a fairly high initial current draw right after a start up but then after a while n the battery is back up it drops off to only a few amps
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