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Please provide the model of your fan and the programmable thermostat you have... in your wiring was there a magnetic contactor attached to your fan? It is a device that to turn on your motor fan or...

What model is your A/C Heating unit? Please provide...

U did not mention what type of heating unit u have?.

I would suggest that you get a new battery... usually battery that comes to a new cellphone is no longer guaranteed will last longer.. battery has life when not charge the cell inside will discharged...

U need to check the current that runs to your alternator... and then check the voltage supply of your lamp and try put a voltage/current filter(resistor and capacitor) normally 100k and 1000mf...