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Complete newb, trying to understand Lm317 w/resistor! :-(

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Ohmmeter (Multimeter set up to measure Ohms)
 
Ok, and im guessing 0 ohms would mean that it is shorted, right?
Right. The reading should be >10megΩ, or ∞ Test both anode and cathode to car body.
 
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There's only one sane way of powering high power LEDs are far as I'm concerned: with a switching regulator. It doesn't have to be anything complicated, just a 555, a MOSFET, inductor and diode will do in most cases.
 
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