Based on this new info, I CANT SAY FOR SURE THE METER IS BAD. I thought it was stuck and never moved. If it stays in the center with nothing on and if a magnet will cause the needle to move both ways back and forth, I wouldnt necessarily say the ammeter is bad!!!!!!
Normally if its working and in the center but you turn on Ignition (NOT cranking, just ON) it should swing to a slight NEGATIVE DISCHARGE as the coil draws around 4 amps. If it swings to + charge that sounds like a meter that's wired backwards ORRRRRRRR the battery is reverse polarity then original. Has the battery been changed and ground reversed????? If so it wont charge right until the genny is correctly re polarized.
With your new info I suspect a charging or genny or regulator problem or the battery has been reversed!!!!!!!!!!!!!
I have a charging troubleshooting procedure but its for Class A systems yet some Fords are Class B. I don't know what your ground was original or if the battery got reversed or if you have an A or B charging system so I hesitate to say much more. Id insure the battery is at the right ground and maybe polarize the genny and see what happens.
NOTE put a voltmeter on the battery and sitting there not running it should be 6.3 volts if a 6 volt or 12.6 if a 12 volt. Then start her up and if the genny is working battery voltage should rise (6.5 to 7 if a 6 volt or 13 to 14 if a 12 volt) If it does that IT IS CHARGING.
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