Vert hold/control ?

[old_tv_nut]

In a multiple-section electrolytic can capacitor, all the negative terminals of all the individual sections are connected to the outer can, and the positive terminals are the separate solder lugs that protrude through the bottom cardboard (not any twist lugs that connect the can to the chassis). When replacing one of these sections, you must remove any wire(s) that go(es) to the positive terminal of that section and connect them to the positive terminal of the replacement capacitor. The negative terminal of the replacement then has to be connected to the same place as the multi-section can (usually chassis ground).

Since you didn't realize the polarity is marked +, you had a 50/50 chance of getting it backward, and you should consider the replacement ruined and discard it.