GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, it's fine to change over tho the H4 plug. You'll need to keep the wires the same as far as the number of wires in each slot. If you click here you'll see how the wires should be connected, compare your plug to the H4 plug in the picture. If I can help further just reply back.
That's right, they'll run fine without the relay harness as long as they are not the 100 watt off road h4 bulbs. I have done this conversion on one of my own S10 trucks and it's been trouble free for a few years now.
They are a big improvement over the old sealed beams, you'll be really happy with this swap.