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[QUOTE=HeadsU.P.;1603530328]The thought of drilling ventilation holes in a car part (cap) that is suppose to be somewhat water proof just doesn't sound right.
No thanks.
There was a reason the old "Points & Condenser" IGN style caps had a closable window on the side of the cap.
To keep shet out.[/QUOT
My car sits far more than I drive it. I am much more concerned about moisture accumulation and arcing than dust making though a few 1/4 inch holes. I will see how it goes.
Coat your terminals where the wires go into the cap with Dielectric grease. You may be getting water going through the cap terminals. I also agree the caps with aluminum contacts for the rotor are cheap garbage.