Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
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The next time it will not crank can you take a 12 volt test light and or a volt meter and with a helper holding the key in the crank position go to the stater and see if you have key on cranking voltage on the Black/blue battery power feed wire as well as the black/yellow crank circuit wire?
Okay let start there , I have also enclosed the start circuit wiring diagram for testing reference. If you find you have power on both wires and its not cranking then the starter is at fault. Let check this and let me know.https://dl.dropboxusercontent.com/u/104923897/starter%20Aug%2018.pdf
Your going to need to wait till the problem is occurring to do you testing . I suspect you may have worn brushes in the starter from the description on the problem you are having but if you can get it to fail and test the circuit as I have mentioned that will verify if in fact that is the case.
If it will not crank over then that when you need to check the power to the starter while the problem is occurring. That should tell you one way or the other.
Glad to hear you got it resolved and thank you as well.