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parrish
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-- 10-14-2010 @ 2:22 PM
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With a positive ground 6v system, does the red wire coming from the resister on the firewall connect to the negative terminal on the coil and the positive terminal connects to the condensor terminial at the distributor (crab distributor)? or vice versa? Thanks all!
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deuce_roadster
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-- 10-14-2010 @ 4:42 PM
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The way to always get that right is to remember that the small (primary) wire going to the distributer points is eventially going to ground. So with a positive ground system the small wire from the positive side of the coil goes to the distributer.
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parrish
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-- 10-14-2010 @ 7:27 PM
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thanks! So when the distributor points close that fulfills the needed ground and thus completes the circuit which causes a spark to jump at the sparkplug gap?
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deuce_roadster
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-- 10-14-2010 @ 8:50 PM
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It is a little more complicated. While the points are closed the coil is building up a magnetic charge and when the points open, this field collapses and creates the high tension current which travels to the rotor and then a spark jumps to the pole on the cap and out the plug wire to the spark plug. The dual points in the old Ford distributor (or any distrib) gives the coil more time to build up this charge and gives a better spark. That is the reason for the dual points.
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supereal
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-- 10-15-2010 @ 8:20 AM
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Most tubular coils have a builtin resistor, so the original resistor should be bypassed.
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parrish
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-- 10-16-2010 @ 8:17 PM
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For a new tube type is it the original resistor under the dash on the firewall that is not used? I have a red/black wire from the steering column ignition switchbox running to the left post of the firewall resistor and a red wire from the right post that goes to the coil...just connect the two ends and skip the resistor? Thanks everybody!
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supereal
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-- 10-17-2010 @ 8:11 AM
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You bypass the original resistor by either placing a jumper across it, or put both wires on the same terminal.
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