Re: 6 volt positve ground
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Posted by Gerald on October 04, 1998 at 08:38:39:
In Reply to: 6 volt positve ground posted by Steve Hamrick on October 04, 1998 at 08:10:52:
: We own a ford tractor. I believe it is a 9N series. I am not 100% sure though. My problem is, I have no knowledge of tthe positive ground system. The tractor will start from a jump and run for approx. one minute then die as if a switch has been turned off. Could this be due to the dead battery, or do I have something hooked incorrectly? How does the positive ground work? It could very well be that the battery is dying that fast after the jump. I bought an 8N 18 or 20 years ago and found that the wiring harness going through the conduit over the engine had worn through the insulation of all the wires at the ends of the conduit, so it didn't charge, but somehow it would run once jumped, probably because the charging system was disconnected. To work on electrical problems you need a voltmeter at least so you can tell what's happning. Your battery could just be really bad and not responding to charging, though the charging system should supply enough to run the ignition. There's no difference between postive and negative ground electrical systems except the polarity. Everything else is the same. You need to go find a 40's vintage Motor's auto repair manual and the I&T 2/9/8N shop manual for a starter. Maybe a fundamental book on automotive electrical systems from that era. They abound in municipal libraries. If it were my problem, I'd start by making sure the wiring was all intact, insulated except at connections and that the connections were clean. Then I'd break for a NEW battery and clean the new battery posts and the battery connectors thoroughly. If it cranked, I'd be happy, though in my 8N the starter bearings were badly worn, but a local automotive electrical shop put in new ones and new brushes for a reasonable price. The ammeter should show a discharge when the key is turned on before starting then with the engine running it should show a charge for a while than taper to zero current as the battery voltage (checked with your voltmeter) rises to 7.1 volts. If all this happens its UTOPIA. Likely the generator needs cleaning, bearing, brushes and a cut out or voltage regulator. But no amount of fixing on the generator will fix a bad battery or shorted wiring. You have to fix things in the right order to keep from going in circles.
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