If the LS deals damage, it is SW.Warhead. The tag defaults to [General]LightningWarhead=, which is set to IonWH in the original rulesmd.ini. I made a quick test and changed SW.Warhead to Mechanical - the LS didn't hurt the tanks. Did you add the warhead to the [Warheads] section?
If the LS deals damage, it is SW.Warhead. The tag defaults to [General] LightningWarhea d=, which is set to IonWH in the original rulesmd.ini. I made a quick test and changed SW.Warhead to Mechanical - the LS didn't hurt the tanks. Did you add the warhead to the [Warheads] section?