Trying to set dwell for points , coil checks out ok , but when I attach leads (per instructions) red to (- ) coil term and black to ground.
I get no readings, but if I put red lead to (+) term on coil and black to ground I can check RPM'S but I can't dial in the dwell ......
What am I missing?

Ken

Maybe wires on your coil are reversed.It will run either way. If you get RPM then that is the wire for dwell
Thanks
Rich

__________________
88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car

The engine will run with the coil hooked up in reverse, but the additional impulse from the secondary coil (which hooks to the tower and the + terminal) may confuse the dwell meter. I've never tried running a coil reversed, so I don't know. But you should fix that.