Rotorua Motor Works is a workshop at 343 Old Taupo Road in Springfield, Rotorua, and it does electrical repairs to motor vehicles. The website says the workshop can repair starter motors and alternators, including for classic and end-of-line vehicles where the original unit has failed. It also stocks batteries for most vehicles and can order the right one.
The full list of services covers engine diagnostics and repairs, all wheel drive, cooling systems, ABS brake and steering systems, fuel injection, intake systems, car batteries, log book services, WOF inspections, pre-purchase checks and formal car hire. The listing gives a Google rating of 4.8, and no nearby comparison is available here.