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Im surprised theres 4 since usually its been 3 wires on them that ive seen people do over the years.Going off of standard electrical knowledge as an unlicensed internet person,
If the red and black has separate connections at the end:
Red -power
black - ground

The other two is curious, this might be a relay box where Blue or yellow light up amber for turn signal flashing and the other is for regular white light. I have no way to confirm either theory so going off of logic. You can test it on the battery terminal bolts if you have experience otherwise its probably not safe to do so
 

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Looking at other installs on youtube for similar models, blue(or yellow?) might be a dimmer trigger when powered. Could explain the 4th
 
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