I see someone else had this same question a while back. I am replacing a thermostat for my baseboard heater. I thought I connected the wires the same way the other thermostat was wired, but when I turn up the thermostat the breaker trips. Inside the electrical box the wires are marked correctly (line & load). Now my question. Which wires go where? I have two black and two red on the thermostat. Where should the line wires go? Where should the load wires go? Red or Black?

Thanks in Advance

PM Steve