I need to find a tach signal for a remote start install, and the location is supposed to be the black wire running from the ignitor.
I thought the signal was supposed to be an AC signal from 1-6V depending on RPM?
However, when I tap into the black wire at the ignitor, the AC signal just jumps all over--reads 1.6V for a bit, then up to 20 or 40V, then back, even on a smooth idle.
Am I tapping into the right wire? (This is a 1990 LS400)
I thought the signal was supposed to be an AC signal from 1-6V depending on RPM?
However, when I tap into the black wire at the ignitor, the AC signal just jumps all over--reads 1.6V for a bit, then up to 20 or 40V, then back, even on a smooth idle.
Am I tapping into the right wire? (This is a 1990 LS400)