Found capacitor on outdoor unit had failed not allowing the condenser fan to start. As far as the burning smell it is the dust on the heat strips burning off. Replaced capacitor and tested system operation. System is now working properly. Temperature difference was 18 between return and supply Condenser fan is pulling .7 amps, compressor is pulling 4 amps, blower is pulling 2 amps, heat strips are pulling 60 amps. Replaced customer thermostat and tested system operation.