My friends and I are having trouble getting a pertronix conversion to produce so much as a single feeble spark in a '79 GTS. We're using the MR-183 kit with the recommended coils (flame-thrower II?). On the bench, we see voltages vary from 3 to 11.x (old motorcycle battery) as we spin the distributor. Apparently this is OK (I expected to see 0 on the low end). Installed in the car and we see nothing out of the coil. The voltage sags quite a bit when starting with an old battery so we even went as far as to hook up a battery directly to the hot side of a coil, thinking that might be an issue. I should admit that the installation has been a bit of a comedy of errors. The first go, the sensors were hooked up backwards. I've been told the smoke show was quite good. Now we have fresh sensors. I think the coils may have been hooked up backwards too but they're showing about 1 ohm across the leads and 10+ kohm from positive to center tap. We had someone over who has a lot of experience with installing them on various old racecars. Nothing amiss found. Any thoughts? We're vaguely suspicious of grounds but can't find anything amiss. Maybe we should test all the way from the battery to the distributor?