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Alarm companies are sloppy amateur at documenting.
There are 2 two types of alarm connections: CUT and 'T' TAP. Most connections are 'T' tapped to vehicle wiring. Ignition wires are 'T' TAP to vehicle IGnition, ACCessory, Constant 12v. The STarter (ignition) wires are CUT, so 2 wires, one to starter side and one to key side. That way, starter is disabled when armed.
Those are the connections. Now DMM meter test the voltages.
The IGnition is generally NOT cutoff, unless you custom CUT ignition for added security.
The STarter usually IS cutoff, CUT, disabled with relay.
Brain -> relay -> 12V constant -> T-TAP -> enables IGnition
Brain -> relay -> CUT -> disables STarter
Brain -> relay -> 12V constant -> T-TAP -> enables STarter (for remote start)
That's what it looks like. :-)
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