Posted by pete 23 on November 09, 2013 at 13:27:41 from (74.33.75.51):
In Reply to: Weak spark question posted by Zachary Hoyt on November 09, 2013 at 11:07:03:
When trying to determine if coil or condenser is at fault, the first thing you do is eliminate the points. By that I mean, either turn engine to where points are open or block them open with a piece of paper or some clean insulation of some sort. This way you don't have to be concerned about points being part of the problem. With points open, switch on, jump distributor side of coil to a good ground with what ever you have handy. A nice short jumper wire works good or a screwdriver will work. Then just make and break contact with your jumper while holding high tension coil wire about quarter inch from a good clean ground. This will tell you if you have a good spark. If you do not, then suspect feed to coil, coil itself or condenser. If you do get a good spark that way, then turn the engine to the point where you can open and close the points by turning the rotor back and forth. If you have less spark you know points are culprit. Also note, you WILL GET a yellowish spark if you spark to a dirty part like paint or grease. Ohm meters, test lights, jumper leads are your friends while checking for ignition spark.
Also, when opening and closing points with rotor, while holding coil wire near or on good ground, you should have very little if any spark at the points. The main reason for the condenser is to prevent the building voltage from causing and arc at points and wasting the stored energy in the coil by causing a sudden collapse of the magnetic field in coil. Pet peeve of mine is people looking for spark at points.
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