alt not charging

spunk · Mar 23, 2012

I just hooked up a new alternator,the ammeter is on 0,and the battery is not charging.I must have a wire in the wrong place.

old · Mar 23, 2012

What alternator and how did you wire it. One simple way to check if it is charging is the magnet trick. Take a screw driver etc that is not magnetic and hold it to the back side of the alternator. If you feel it pulled toward the alternator like a magnet would then the alternator is in fact charging

TMo · Mar 23, 2012

What kinda tractor is it, 6 volt or 12 volt system? Are u talking about the ammeter gauge or a multimeter with ammeter capabilities?

souNdguy · Mar 23, 2012

delco 1 or 3 wire alt with internal vreg?

older alt with external vreg?

can we assume 12v neg grnd?

if 1 wire, are you revving it up high enough to excite it? some need as high as 1800 rpm.

if 3 wire, have you hooked #2 to charge stud, and #1 to switched side of key thru an idiot lamp?

post back some details.

spunk · Mar 23, 2012

thanks for the response,I know I didn"t give enough info. Delco alterntor,3 wire exteral regulator.Grey from #1 on regulator I know to be field,so I connected that to(F) blade terminal on alternator.#3 terminal on regulator(lt blue) I connected to(s) terminal(second of 2 blade plug). Both are 14 ga wires.The 10 gage wire from hot terminal to ammeter.The lt blue is the one I am guessing at.Its hard because the schematic I have shows all these wires ending up at a circle representing the alternator,but not exactly showing where they connect.Thank you to everyone who responded.I hope that"s enough .

teddy52food · Mar 23, 2012

That only means that the rotor is energised. The stator windings may be open or shorted to ground or the diodes may be bad, so it still won't be charging.

alt not charging

spunk

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old

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TMo

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souNdguy

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spunk

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teddy52food

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