Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Issued New Clearance; Flight Crew Returned To Departure Airport
Aircraft; Weather
The First Officer/Pilot Monitoring noticed the turn coordinator was unstable and was giving us incorrect indications. After observing erratic indications and taking into consideration the weather that was at our destination; we decided to return to ZZZ. We were VMC and we were halfway to ZZZ1 when the decision to turn back was made. The weather in ZZZ1 was low visibility and so we elected to turn back and remain in VMC. We contacted ATC and got a clearance back to ZZZ. We ended up cancelling a few minutes later. Then; we let [Operations Control] know what the issue and plan was.
C402 Captain reported returning to the departure airport due to a malfunctioning turn coordinator.