For what it's worth I just measured the voltage drop in the driver's side headlight at highbeam. With 14.24 reading across the battery terminals and 14.0 showing on the digital voltmeter gauge in the console at 2k rpm the voltage measured across the highbeam as the wiring entered connector #1021, which is essentially the bulb socket, was only 11.68. I'm probably going to add the headlight relays from Mad Electrical to see if it makes a difference.
All of this was occasioned by my disappointment in switching to the PIAA #9007 bulbs last night. Yes, they are a little brighter but not $80.00 worth IMHO.