electical question-troubleshooting

on my superjet- my battery is good and strong and turns over most of the time , every now and then nothing happens when i hit the start button and i hear a couple of clicks in the elec box, i then put the battery charger on literally for 2 seconds and everything is good again for awhile-this happens every couple of days, i do have msd ignition- any suggestions? is the msd going bad?
 

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Race Gas Rules
Location
Clearwater Fl.
Not usually the MSD cdi, start looking for a bad ground cable and then check the red battery cables. next could be the relay or just a bad starter...
 
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