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Wire color is simply an easy tool for tracing on wiring diagrams. Aftermarket companies don't always care about matching factory style because they don't have to. Look at your factory plug. You'll see what order the wires go into it. Make sure they go into the new plug in the same order. If that's good, you have another problem. Does your passenger side work properly? If so, swap bulbs and see if the problem follows the bulb. If it does, the bulb is broken. If it doesn't, there is a problem in the wires somewhere. You said brights worked before you changed connectors, so either you messed up the wiring, or didn't make a solid connection in your splice.
Voltmeter is easy. Black lead goes to ground, red lead goes to hot. It doesn't matter too much if you get the leads backwards in this type of measurement. You'll simply read -12vdc instead of +12vdc.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776