It is very easy. From the donor Pull the grill, headlight trim, the headlight buckets that are attached to the radiator core support, the lights themselves, and grab the last couple feet of the wiring that plugs into the 4 head light bulbs. With the wiring harness you can put flat spade plugs on the three wires and just plug them into the plug that used to hook to the two headlight bulbs. One is a ground, one is low beam power (goes to just one of the two plugs) and the third is high beam power. My 79 it worked fine without worrying about extra fuses. The two headlamp system uses thermal circuit breakers under the dash to protect the headlight circuit instead of the four fuses used by the four headlamp system. In my case at least, the circuit breakers handled the four bulbs just fine.
Another good upgrade would be to install relays and heavier wiring going from the bulbs directly to the battery. Use the original wiring to drive a relay for high beams and another for low beams. There should be a fuse between the battery and each relay. The direct power run over heavier shorter wires to the bulbs results in more voltage reaching the bulbs.
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good
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