C550 DECLARED AN EMER ON APCH DUE TO BURNING ELECTRICAL EQUIP ODOR IN THE COCKPIT.

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ON AN IFR FLT FROM ZZZ TO EWR JUST PRIOR TO BEING VECTORED TO A FINAL FOR AN ILS TO RWY 4R UNDER VISUAL CONDITIONS WE HAD A 'HOT' ELECTRICAL ODOR IN THE COCKPIT AND NOTICED THE CTR INST LIGHTS WERE BEGINNING TO DIM. WE SHUT OFF THE PANEL LIGHTS AND THE ODOR BEGAN TO DISSIPATE. WE; HOWEVER; DEEMED IT APPROPRIATE TO DECLARE AN EMER AND LAND AS SOON AS PRACTICAL. THE FLT WAS CONCLUDED WITHOUT FURTHER INCIDENT. UPON ARRIVING INTO FBO AT EWR; WE CONSULTED WITH OUR DIRECTOR OF MAINT AND THE LEAD MECH AT THE SVC CTR. THEY CONCURRED THE PROB WAS A POSSIBLE INVERTER PROB FOR THE CTR PANEL LIGHTS. CITATION DID NOT HAVE STAFF AVAILABLE; SO WE DECIDED TO ADDRESS THE PROB IN THE MORNING. IN THE MORNING IT WAS DECIDED THAT IF APPROPRIATE WE WOULD FLY THE ACFT TO ZZZ. WE STARTED ENGS AND RAN ON THE FBO RAMP FOR ABOUT 15 MINS AND COULD NOT DUPLICATE THE PROB OF THE PREVIOUS EVENING. WE RAN THE ACFT ON THE RAMP FOR APPROX 15 MINS AND COULD NOT DUPLICATE THE ODOR/PROB. WE THEN DEPARTED FOR AND ARRIVED AT ZZZ WITHOUT INCIDENT. CITATION SVC AT ZZZ TOLD US THAT THE CTR INST LIGHT INVERTED SMELLED BAD; SO THEY CHANGED IT OUT. OUR MAINT DEPT AND CITATION ZZZ WERE VERY CONFIDENT THAT THAT WAS THE CAUSE OF THE ODOR.