Appreciate any help here: I'm drawing my source from a kitchen light. This set of wires continues to a junction box in my attic. This junction box has four separate wires leading into it. One from the source that I just described. Two other wires lead to separate switches in the kitchen (one of which connects to a dining room ceiling fixture, and one wire continues from the junction box to that ceiling fixture in the diningroom. I am unsure of whether I need to connect all four black wires in the junction box, and then to connect all four white wires in that box as well. All I know is that the kitchen light is working, but the diningroom light is not, although when I check the diningroom wires with a multimeter, I do get a reading of 10 ohms, when the corresponding switch is turned on.

Any advice?

Assuming the feed is at the two switches, the pair of wires from one switch should splice onto the pair going to the kitchen light, and the other pair should splice onto the pair going to the dining room light, so that two wires go directly from each switch to each light.