J1 NGK HT Lead, Fittings & Sets Spark Plug Cap NGK J1 Cable Splicer for 7mm HT Cable NGK also knows what a hassle it can be to connect new wires to the stock CDI ignition coil. WeÄôre making that a whole lot easier with this new in-line wire connector. Simply insert the lead from the ignition coil unit in one end, the new NGK wire end in the other, screw the two pieces together, and youÄôve got yourself a watertight finished piece! Made of high-impact plastic, this handy unit will solve all wire connection problems.