Relays are always a good idea especially when running hologens (now that being said, I still have not gotten my relays installed.) The wiring on these old truck is yes old, and also when new, they were almost at max capacity. The relays are easy to instal.... Use the existing wires to power the relay, run new wires from a power block to the relay, and then from relay to the headlights. Then when you flip the switch, the old wire is carrying only the amount of power needed to turn on the relay, and the new heavier wire is carrying the power for the headlights.
As for the dimming, I am trying to remember an old rover that did not brighten up when running at speed. I tend to have my idle set higher as I drive in stop and go traffic, and it is easier to feather the clutch at higher idle ( I can almost take off from a standstill on a bit of an incline without touching the gas.... )
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Andrew Barr.
1972 Series III 109.
"the Tin Turtle"
"However, that was his ploy and I caved....totally caved...   LOL!" Jellijo 
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