Coils failing on 1993 club car

[gl4276]

I have a 1993 club car and have problems with the coils. It ran perfect for 2 years then the coil failed. I took it the authorized dealer and they replaced the coil and it ran fine for about 1 to 3 months. They replaced the coil 3 times and since then I have had to replace the coil 6 times about every 3 months.The gap is correct from the coil to the flywheel. The dust cover is on correctly so the fan works properly. The spark plug is not fouled and is working good but the spark appears to be weak on all the coils that I have installed. Could anyone comment what could be causing the coils to fail and recommend how to correct the problem..