Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Do you want top just get it back to the state it was in before the alarm was tripped? If so you can unhook the negative terminal, insert the key into the ignition and turn it to on, then reattach the negative battery terminal.
Or are you looking for a way to permanently remove the alarm?
Thanks. What exactly is the truck doing when you try to start it?
This would be unrelated to the alarm.
Your primary suspects here would be battery, then ignition switch, then starter.
What you would want to do is first get the battery load tested to make sure it is holding full amperage capacity. If it is, then the next step would be to wait until the problem is present and then detach the small signal wire from the starter and check it for 12V when the key is turned to Start. If there is 12V there but the starter is not operating, the starter is faulty. Be aware it is strongly recommended to stay with factory starters on this model as it is extremely common for aftermarket ones to not fit properly.
If there is not 12V on that signal wire when the problem is occurring and the key is in the Start position, then you have a control issue, which wiring aside would be limited to the ignition switch or the neutral safety switch. In this case, try starting the truck in Neutral instead of Park and see if there is any change.... if it starts, the safety switch is faulty; if it does not, the ignition switch is faulty (extremely common, way more than the safety switch).
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