Posted by Jon Hagen on March 03, 2012 at 11:46:28 from (69.26.23.96):
In Reply to: Farmall 450 Amp Meter posted by Ellsworth Chase on March 03, 2012 at 08:43:32:
What voltage are you seeing from the alternator ?? It must 13.5 volts or above . Normal Delco 1 wire alternator voltage with a full charged battery is 14.2-14.8 volts.
If the alternator is putting out 13.5 volts or more, and the ammeter still does not indicate charge, I suspect the ammeter is wired wrong.
One battery post must have nothing but the battery connected to it. The other ammeter post should have any accessory load such as ignition or lights, plus the "BAT" output wire from the alternator attached. The ammeter's only job is to indicate power flowing into or out of the battery. To do this, the battery must be the only thing connected to one ammeter post while all other load and charging connections must be on the other post for it to indicate correctly.
If the one wire Delco alternator does not produce 13.5 or higher voltage, it may have lost it's residual magnetism that allows it to self excite. To Excite the field and restore the residual magnetism, touch a wire from the #1 blade terminal at the rear edge of the alternator case, below the rectangular regulator plug socket. You will see the numbers 1 and 2 cast into the alternator case below the plug socket. With the tractor running about 1/2 speed, touch a wire from the big "BAT stud on the alternator rear to the #1 alternator blade terminal. It only needs to touch for a moment. The field magnetism will be restored and the alternator will now charge a normal 14+ volts.
Normally you will not have to repeat this excite procedure unless the alternator is worked on or the tractor sits unused for a long time.(months or years.)
Also make sure the fan and alternator belt are tight. I have worked on several h-450 IH tractors where the no charge problem was that the fan belt was too loose to turn the fan / alternator fast enough.
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