Reply To: Spark tester.

[mercuryman]

Make one with short piece 1 x 2 drill 1/2 hole near one end. The drill hole from side into 1/2 hole. Screw 1/4 x 20 bolt into hole and cut off head. Drill hole opposite side from bolt and screw wood screw here. Hook plug wire to bolt and connect jumper wire with clips on each end, one to screw the other to ground. Now keep turning screw out until spark stops. If you have real good spark you will have about 1/4 gap. And don’t turn screw when spark jumping. Cost two small clips.