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at the furnace...take doors off and take a couple pics.
Then post here and I will mark test points. If you cannot post pics I will try something else
you can use the attach files link by the dialog box..if that does not work we will try something else.
I will start another way with drawings from end in the meantime
first lets start at switch on side of the furnace...is this a switch only or switch/fuse combo?
Downloading now, just a moment
first item click HERE
ok follow the wires from that fuse into the furnace...it goes to a pop out door switch..do you see that?
Also see HERE
can you pick up any voltage around the fuse area at all
sounds like it is bypassed....have you checked at breaker first? In electric panel
Your fuse is already gone so it has likely been bypassed. Does the black wire come in behind that fuse holder and go straight into furnace?
See here too
lets find a spot with power and work the other way..
Do you have power in the on/off switch on side of furnace?
we would need a voltmeter ..with power ON we would put red meter lead to black wire and black meter lead to white wire or ground.
Did you look at the bottom of the circuit board that I asked about earlier? The bottom of the board looked like it had been under water or burned
and is the door switch that pops out taped down or held down when you tested that wire?
ok, tape down door switch or wire past it
blk to board
did you trip breaker when it sparked earlier?
I would replace breaker and get sure that we have 120v at breaker...then check back at the black wire to board again.
If you have replaced a breaker before it is not necessary.
Turn breaker off you are removing.
pop out the breaker
remove the wiring
wire onto new breaker
pop new breaker in
turn on breaker
I am not familiar with that meter so I am not sure.
You could also just remove wire from breaker and wire onto another breaker that you know works as a test
can you tell me the last place you read power?
Is the switch on the side of furnace carrying 120v?