Matt - i know the latest ones just have black heat shrink on them - is there any original underneath? if so this should have the negative markings on it.
The other method would be with a multi meter that has capacitance check.
Other than that i have 2 speedos sat here, and this rings true for both of them: Look on the opposite end to the terminals - you have what looks like a "T". The terminal closest to the straight top of the "T" is negative, and the terminal closest to the base of the "T" is positive. I have some more caps somewhere, and would be good to check those, but not 100% sure where they are!!! but that is true for the 2 that i do have to hand.
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