Electrical Problems

[smitty16s]

Ok I changed both my batteries last week, and today I flash by brights to let someone out in traffic and my whole truck studders, about 5 min later i flash them again and the whole truck shuts off and wont come back on, it just makes this weird fluttering sound, after a few min. of looking around and tightening battery clamps i try to crank and nothing, I decide to push the brights on and off and it cranks right back up, i get home and flash the brights for about a minute straight and it works fine?? does anyone know where to start looking for the electrical problem?

[smitty16s]

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[smitty16s]