Good news: The hack job was done in such a lazy manner that all I need to do to fix it is buy a replacement bulb, remove the offending added parts, yank the two shoddily installed extra wires out of the original connector to the headlight bulb, and plug it in as designed. Parts should run about $20.

I know the mod wasn't done by the guy I bought the bike from, since he didn't do anything to the bike except ride it and put gas in it. It was someone before him.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.