I have a Deep Freezer with a Power ON light and a Run light. The power light is on as long as AC power is supplied. The run light only comes on while its chilling. What I need is something to turn on a timer when the RUN light is on and shut it off when the light goes off. I know a photo cell would be needed. I don't want to open the thermostat housing to parallel with the run light, which I thought about doing, as it is in parallel with the compressor but inside the thermostat housing. One false move and I ruin the charge. Thanks in advance.