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View Full Version : Dwell/Tach Hookup to Pos Ground with Petronix?



karls59tr
05-28-2011, 09:33 PM
I want to hook up my dwell/tach to my Pos Gr TR3 with Petronix but I dont want to fry anything. The green clip is supposed to connects to the -coil terminal and the black clip goes to - battery terminal. But this is a POS gr car so what would be the hook up here? My dyslexia strikes again. :-)

TR3driver
05-29-2011, 10:16 AM
You're not likely to fry anything Karl, the meter is almost certainly protected against anything you could do wrong (except maybe laying it on the exhaust manifold :smile: ).

Because of the unusual way the positive ground Pertronix connects, I believe you want to use exactly the same connections for the dwell/tach. The green clip goes to the same coil terminal that has the lead from the Pertronix (which should be the "-" or "SW" terminal), and the black clip goes to the "-" battery terminal.

karls59tr
05-30-2011, 06:08 PM
But dont you want the black clip to go to "Ground" which would be the + Pos terminal on a TR3?