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What colour would a Techmarine's jump pack be if he had one? I'm making a Black Templars Techmarine with Servo-jump pack at the moment and thus need to know.

Because it's a Templar, go with black, for contrast.

It'd likely be red like the armour, but black would probably look nicer with the other Templars around.

Most likely the rust red color the rest of the armor should be if its personal equipment, but I don't think the jump pack is a "part" of the armor in the way the gauntlets or shoulderguards are and is instead chapter equipment not a personal one, so there is no reason you can't go either way, what ever you feel looks better should work.
Personally I would go for equalization of both colors so the jump pack would be black to contrast all the red.