Do I have a short in my coil or distubtor?

[75zhead]

Greetings all

I have a stock 75 280z. Electronic ignition. When I try to use my digital multimeter (set to 6 cylinder) to set my rpm. After I connect ONE meter wire to the coil I get a rpm reading but as soon as I hook the other to a ground, the meter zeros out. If I hold it close to coil I get a reading, but as soon as it touches metal it goes to zero.Reading varies by how close I hold meter ground wire to coil or metal. Doesn't seem to make a difference on what meter wire configuration I use. Been fixing cars for 40 years never ran across this before, searched google, searched here and other z sites. Must not be using right search phrase. I'm stumped! any ideas why it's doing that? Sorry if I am not clear enough, or you need more info just ask.

thanks for taking the time to read this.

PS tried it with analog meter same results

Rich

[75zhead]

well I upgraded to ZX dizzy and blue bosch coil and now everything is perfect. I hook meter to coil and ground and get the rpm reading correct.

Thanks for all the help