Posted by ScottyHOMEy on November 02, 2008 at 12:28:51 from (71.241.196.250):
In Reply to: super c starter motor posted by lachleaves on November 02, 2008 at 09:03:32:
Not silly questions at all.
To the polarization question, the generator stores a residual magnetic polarity in the field coil (I believe that's right, but it may be the armature) as long as it remains connected to the battery. When the connection to the battery is lost, whether by removal of the generator, the regulator or relay, or the battery, that residual polarity is lost. NOT a big deal to repolarize, if that's got you concerned. It's a matter of reconnecting everything and, before starting the tractor, simply touching a jumper wire between the BAT and GEN terminals on the regulator/relay. This will make a quick, small, harmless spark, but does the job of establishing the polarity. Not a big deal at all, easily done but easily overlooked, and needs to be done anytime the generator loses contact with the battery.
If you want to use a 12v battery to test your starter and switch, that's fine as far as it goes. The 12 volts won't hurt your starter as long as you don't crank on it for too long at a time and allow it to cool down if you do find it getting warm before trying again.
And you're absolutely right, as long as you don't turn on the ignition switch, you can hook up the 12v battery to test the starter. As a caution, I'd hook it up just as you describe, + to earth/ground, - to the stud on top of the starter switch. To isolate the rest of the system from the 12 volts you could go one step further and remove the other wire that is connected to the starter, leaving only the battery cable connected. Keep track of the wire, as you'll need it later, but the tractor will crank just fine without it (assuming a good starter and switch AND a good ground for the cable from the + side of the battery) and you'll have isolated the rest of your system from any damage that might result from 12v or reversed polarity and any unconventional wiring that may have been done over the years.
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