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Hi, I'm Mike G and I'll be assisting you.
The new timer required a neutral connection. Having 2 blacks on the old one indicates one is hot and the other is the switched hot. Connection of a jumper from white wires in the box to the timer will solve your problem. A tester will identify the Line wire. It will read 120V to ground.
Jumper= short wire
Terminations should be marked. (L in)Hot, Neutral & (L out)Load.
Diagram not clear. There should be L in. L out & Neutral.
You are testing for the hot wire not the neutral. The whites are neutral. One of the blacks is a hot, the other the load wire.
Hot to ground = 120V
See the Drawing attached.
The white wire is a jumper from the existing 2 wire connection. You need a tester to identify the hot wire (L in)
What are you using for a tester?
Give me the count and colors of the wires.
No problem, as you will