IN a 94... What converter do you have?
A 50,000 uF sounds like a hardening capacitor used for high end high power audio installs
OR: ... a "Battery Simulator" (A term Magnatek used to use to describe how they got a 6300 to work WITHOUT a battery.
Should you decide to replace it. try high end car audio stores.. Normally I'd recommend replace with a capacator of the same uF rating. but in this case you can go smaller or larger by half the voltage rating of 15-20 should be good.. I'd not go much over 20