I replaced the headlight switch on the dash and made sure battery terminals were clean and tight
No! The ECM is the Electronic Control Module (Computer), sometimes called ECU, Electronic Control Unit. The ignition switch is just that, the switch that controls the engine ignition, the power to the starter, starting and shutting the engine off, and power to the accessories.
Yes, inasmuch as they turn off when you shut off the engine and remove the ignition key; and the standard daytime running lights come on when you're driving. You have to switch from DRL to headlights with a switch, though - but in my soob I just leave my headlight switch on all the time anyway.
Battery cables could be loose, battery could be bad, starter could be bad, starter solenoid could be bad, ignition switch could be bad. Turn on the headlights and try to crank the engine. If the headlights dim or go out look at the cables or battery. If they stay bright look at starter, solenoid or ignition switch. The neutral safety switch or clutch petal switch could do it too.
Yes, sometimes a faulty ignition switch can cause the engine to not fire. Also, a bad spark park can the engine to not fire.
Mine is built into the ignition switch. After you crank it turn the key back to the left slightly.
If it's like a 1996 tracker the headlights won't come on unless the parking brake is released or the light switch is on.
Loose or corroded battery cables? Weak battery? Bad ignition switch?
The headlights on a 2000 Mercury Mountaineer may stay on after shutting down the engine due to a malfunctioning headlight relay, a faulty switch, or a problem with the auto headlight feature if equipped. It's also possible that the "headlight delay" feature is activated, which keeps the lights on for a short period after the engine is turned off. If the issue persists, checking the vehicle's electrical system or consulting a mechanic may be necessary to identify and resolve the problem.
Generally the ignition switch activates headlights on a riding mower and the start position only send current to the starter solenoid. If you turn the key and the engine cranks over than the lack of spark is going to be something else. If it is a riding mower you will have several safety switches to prevent start up under unsafe conditions.
Set your light switch to "auto" on the dash and your lights will come on automatically with the ignition. Turn your light switch on your dashboard to "auto" or "automatic" and the lights will come on and off with your ignition switch.
check the door switch
It sends a power to the starter relay/solenoid to engauge the starter. Know that the ignition switch is not what you put the key in and turn. That is the lock assembly. The ignition switch is located lower down on the steering column.