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We did the relays on our headlights on mine and a friends truck today. My lights are considerably brighter. I'd have to say at least 50% brighter. The mod is in the tech pages .
I also odered some crystal cut H4 Zenon HID lights that should be in next week. That should make them even better. Very worth while mod for these old trucks. I'll never have the headlights flashing syndrone again
Clint
I also did the relay conversion. It worked out slick. For headlamps I installed the Hella halogen vision plus with the clear blue bulbs. WOW, I can see for a long ways now.
Did you also use a jumper wire to keep your low beams on at the same time your high beams are on? That also makes a world of difference.