A power stage in my 960 has failed twice in a month. The car is now in the shop because I could not find what is causing the power stage to fail. I have made a test of the wiring from the power stage connector and the coils and everything is according to specs. The coils also tested correctly. Also the common lead to the ignition relay is OK. The wires on the cylinder head are pretty toasted and the coil plugs are not in very good shape, but there is good contact on everything. I would appreciate any experience in this matter.

I could imagine that a stray ground in the secondary ignition could toast a power stage very quickly: check your ignition wiring and COP connectors for failing insulation.

This was the result of testing. Everything looks good, so what may be the problem? any opinions?

Ignition OFF
Spark plugs OK
Ignition coils resistance 1 ohm, OK
Ignition contact common lead to relay base continuity OK

Ignition ON
High resistance between 2,5,7 power stage contacts and ground OK
Volts between 2,5,7 power stage contacts and ground. 0 volts
Volts between 1,3,6 power stage contacts and ground. 0 volts
Resistance between 4 and ground 0 ohms

Ignition OFF
Resistance between 1,3,6 power stage contacts and ground. Infinity
Resistance between 1,3,6 power stage contacts and coil connector 0 ohms

Steve,Thanks and forgive me for my poor knowledge of terms, but what COP stands for? The car is a 960 by the way. The insulation in half of the coil plugs is gone. Could this be the problem?