Never forget--it's highly desirable to keep molten copper from splattering on you or your clothes.
Hope there is a properly rated fuse in the control circuit. Like, say, a KTK-3R... I would not repower anything without a proper control-citcuit fuse.
It's just a careful process of elimination.
Was it a plugin photocell? Bench test the new photocell.
Trace all wiring. Check voltage with the cell unplugged. Then connect a milliammeter in the line/usually "black" lead of the cell and carefully power it.
It is remotely possible the cell was defective, but make damn sure everything else is OK before the second "test."
[This message has been edited by Bjarney (edited 10-01-2002).]