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There is no way to check that many amps with your multimeter. Take it to any parts store chain and they can test it in the car. If you have it out they can test load and voltage, but the best way is for them to use their equipment to test the actual amperage flowing through the wire. They have an inductance clamp that measures amps by the magnetic field generated by the current in the wire.
You are right, its all DC. Its hard to answer how much amperage you should have since its partly determined by the load you're putting on it, but the parts store folks can test everything else with that same machine and find out what's going on by the process of elimination.
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