Posted by pete 23 on November 10, 2010 at 16:59:41 from (184.12.34.48):
In Reply to: Poor spark posted by best785 on November 09, 2010 at 22:28:24:
From the looks of your picture I am betting you have a 12 volt coil which would explain what they told you about a resistor. They most likely meant the resistance is inside the coil by having more primary windings and is therefore a straight 12 volt coil. What you should have for a good hot spark on that model tractor is a 6 volt coil(it may be marked 12 R which means for use with an external resistor on a 12 volt system) or it may just say six volts. Anyway, you need an external resistor(ballast) connected in series with the coil. Then that other wire I think I am seeing on your picture(white one) goes to the starter solenoiod ign terminal , then to pos side of ign coil and when you have the starter engaged you will have full battery voltage to the coil bypassing the resistor for starting purposes. During starting you voltage (with good wiring and battery and starter will normally run about ten and half volts so you can you have much less available to the coil if you don't have a bypass system. Also, if the ign wire to switch is as bad looking as the rest of the wires on that tractor you may need to do some rewiring. I always cut off that extra spark plug wire length also to reduce resistance and tidy things up a bit.
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