Circuit blows when i turn off switch
Disconnect all four wires up at the heat lamp.
Turn on the breaker. Measure the voltage between every combination of two wires (excluding ground wires) up there. Flip the switch and repeat these measurements.
You should find that exactly one combination shows 120 volts and it is the two wires from the same Romex cable (that goes to the power source).
Now measure voltage between ground and each black or white wire in turn. Only the black that gave a 120 volt reading should give a 120 volt reading this time.
Turn off the breaker.
If everything checks out as I described then connect the other black wire (without a 120 volt reading) to the heat lamp black. Connect the white from the hot Romex cable to the heat lamp white. Connect the remaining two wires (one from each cable, one black, one white) together. (The cable with no hot readings went to the switch)
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Last edited by AllanJ; 04-18-2011 at 09:42 AM.