Look up how a cap works for noise suppression. You put it across the load in a high impedance circuit to suppress high frequency noise.
If you connect the 2 leads that it has together, you are basically shunting the circuit straight to ground (aka a short). Like I said before, the reason something hasn't caught fire yet is because your ballast resistor is limiting the current.
If your condensor is broken and you don't want to get another, tape off the end that goes to the harness and remove the grounded end.
I would also check your ballast resistor as you might have damaged it from putting so much current through it.