How hot should a coil get? My lock relay coil wrap on my Williams 1970 EM is a tiny bit yellowed. After it has been on for a half hour or so - the coil gets hot. If you hold your fingers 2 inches over it you can feel the heat rising like putting your hand over a birthday candle. I checked my other Williams EM to see if it did the same but it didn't get hot like that. Is this no big concern? I just worry about leaving it on all day (it will be put in an employee break room for a month) and having it just burning up. I know it isn't an emergency or anything but my question is - is this normal and ok?