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Subject: Amp meter

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Bob E    Posted 11-20-2018 at 22:45:46 [URL] [DELETE]        [Reply] [Email]  
  • Amp meter
  • I have a 1952 Ferguson TO-30 6volt side distributor. Question I have is that the amp meter needle bounces back and forth very very rapidly between 0 and 15 very wild movement. The tractor is positive ground, I attached my volt meter to the distributor and it shows 6.78, at the battery it shows 6.37, these readings with the tractor running. Any ideas why the dash meter jumps so much on the reading? Thanks Bob

    Bob E    Posted 11-21-2018 at 19:42:34 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • I had replaced the voltage regulator with a new one because the previous owner had a 12 volt battery in it, battery was 10 years old and dead, as is the previous owner. Wiring is not in a harness as it appears he ran new wire to each connection. I have a spare generator so I will try that to see if I have the same result. Thanks Bob

    Tim Daley(MI)    Posted 11-22-2018 at 04:47:05 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • Bob-
    Just replacing parts because you 'think' they may be bad is not a very logical approach to solve a problem. I doubt if your VR was/is bad. Some N Owners slap a 12V battery in their machines and leave the VR and genny and they will run. There were 12V generators too. A typical 12V switch over job removes the genny and VR from the circuit and replaces them with an alternator. You can perform a motoring test on the generator to determine if it is good or bad. Your local starter shop can also do this. He can also test the VR and AMP GAUGE as well. The I&T F-04 Manual has a chapter on performing a generator motoring test. I would do that first, verify battery has a full sustainable charge on it, and then proceed to go thru the entire wiring setup. Disconnect all the lights just to take them out of the circuit for now. A good wiring harness helps, keeps wires contained and ID'd by color, but many fellas have ho-made wiring jobs and that can be a culprit especially if the same spool of wire is used for all the wires. Do a continuity test on all wires. Don't use an idiot test light, those require power and you don't want that. Here is a wiring diagram for the Fergie TO-30, 6V/POS GRN system -see LINK from the Ferguson site. While battery and generator are being tested, verify wiring. I'm leaning towards a faulty wiring job as your root cause. I do know many times fellas attempt to wire lights on the tractors and end up doing it wrong and the result causes other issues.

    Tim Daley(MI)

    Bob E    Posted 11-22-2018 at 10:48:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • Thanks for the diagram, I do have IT manual and all connections appear to be wired correctly. Gauge of wire not may be incorrect. Tractor does not have any lights. Generator bearings sound dry, applied oil in the ports. Stopped by a rebuild shop for the generator (spare) and the tech said it was weak but would not say the exact output when I asked, so I thought I would try it on my tractor since I don't have anything invested in yet. Have a Happy Thanksgiving to all! Bob E

    Tim Daley(MI)    Posted 11-21-2018 at 07:37:15 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • HiYa Bob-
    Have you checked the belt tension on the generator? This is often overlooked as a culprit so if it isn't a faulty VR, a genny in need of rebuild, or faulty wiring, look into the belt and tensioning device. I don't think it is a faulty AMMETER, although a loose connection on it may be a cause. If you need more help, I would go to the FENA site and ask their technical advisor, Bob Sybrandy. Once you determine the root cause, let us know as it will help others who may have a similar problem.

    Tim Daley(MI)

    steveVa    Posted 11-21-2018 at 02:39:58 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • Sounds like a bad relay connection in the voltage regulator. Or burnt contacts in the vr.

    K.LaRue-VA    Posted 11-20-2018 at 23:52:34 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • Look for a loose wire, wire insulation rubbed off and going to ground, or wires melted and shorted together in the harness.

    Tony C    Posted 11-21-2018 at 04:15:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Amp meter
  • Brushes bouncing in the generator or a block on the commutator about to break loose or burned badly????

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