Posted by rvirgil_KS on March 29, 2009 at 20:15:04 from (72.214.203.115):
In Reply to: 6 0r 12 volt? h posted by javan on March 29, 2009 at 18:16:43:
If I understand your first post, there is presently no battery in the tractor. Your second post indicates a distributor, not a mag.
Here are some ways to determine 6 or 12 volt, + or - ground:
1. Does it have an alternator? If so it's 12 volts and negative ground.
2.Does it have a Delco generator?
If yes, does the F (field wire) on the generator go up to the light switch? If so it's probably 6 volt.
If the F (field wire) goes to a regulator, is the voltage and polarity stamped on the cover of the regulator?
Is there a tag on the side of the generator? Black tag is 6 volt, red tag is 12 volt.
3. If you have an ohm meter, measure the resistance across the + and - terminals on the coil. Less than 2 ohms it's a 6 volt coil, more than 3 ohms it's a 12 volt coil.
If it's a 6 volt coil is there a resistor (ceramic device about 1/2 in. square and 2 to 3 in. long)in the wire going from coil to switch? If so it has probably been converted to 12 volt.
4. To determine polarity or ground:
With battery connected and engine not running, turn on lights or ignition. Ammeter should swing slightly negative. If ammeter does not move jumper the wire between coil and distributor to ground (switch on). This simulates closed points and may be easier than removing distributor cap. Negative swing, OK. Positive swing reverse the battery connections.
Wire from distributor to coil should match battery ground. (Positive ground, distributor wire connects to + on coil. Negative ground it connects to - on coil.)
If it has a generator I would polarize it when I get the battery in it's correct connection.
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