Wico OC No spark when hot


New member
Hey all,

I have a few OC mags that spark great when in the shop, but once I put them on my engine and let the sun hit them for a while, they lose spark. I thought it might be a condenser, so i replaced it in one mag, just to have the same issue. Any other ideas? Do the coils or magnets get weak with heat?

Greetings Con-rad, Possibly a bad coil. As it warms up, either the windings produce an open circuit or short out. Try to re-create the situation with a hair dryer. Be sure you have a sparkplug attached and grounded properly other wise damage to the coil could occur. Enuf Said


Active member
Sure sounds like a coil problem breaking down and the spark tracking to earth. A new coil should resolve your problem.