[RedBarchetta]

Friends,
Here's my situation. I have a digital multi-meter and I want to test the output voltage coming from the "tach output" on an MSD 6AL. This is typically a single wire that goes from the MSD box to the tach signal wire (or to an MSD tach adapter). On an SPF, the tach signal wire is black/green.

My tach is dead and I want to test the MSD 6AL for output voltage. A reading of 1-5 volts is normal....a full 12 and the MSD box (tach output connector) is bad and needs to be fixed at the factory.

On this digital multimeter I'm a total novice on "what" and "how" to probe. I know enough to set the dial to 20V (20 volts or less), but I have no idea where to probe the black wire to complete the circuit.....ground????

I feel so stupid....

-Deano