TRLitsey is right, the issue is with linetype scaling. This linetype is meant for use in metric drawings, and your drawing appears to be either JIC or NFPA. If you were to set a linetype scale of .03937 for that line, it will display properly.
The line in your drawing is scaled at the default factor of 1. At this factor, your line is too short to show you anything more than a portion of the first line segment. To see how/why this is, go to that drawing. Click once on the line. See the little squares on each end? Those are called grips. You can stretch things with them (among many other things). I want you to grab the right-side grip, and then drag it across the drawing really far. That's a 36" title block, so drag the grip over like 5 feet (60"). Seriously, it needs to be that long for this. Once you let go of the grip, the line will now be whatever length you dragged it to ... and it should also be dashed. Play with it for a second, drag the grips around. Notice how it maintains the relationship between the length of the dash and the length of the space, regardless of the overall length of the line. But if you make it too short, it will go back to not displaying the spaces.
Now, since we see that the scaling of this line is totally out of whack for what's happening in the drawing, we need to fix it. You could adjust the scaling of the line, but I think your best option is to leave scaling alone (a personal preference, I admit). Let's try a different linetype instead.
Hit ESC a couple of times. Enter LINETYPE at the command line. We're going to load up a couple. Pick these: DASHED, DASHED2, and DASHEDX2, and then close the dialog. These linetypes are more sutiable for drawing in imperial-units drawings.
In the drawing, that line should still be ridiculously long. Make three copies of it, for a total of four. Select the first copy. In the PROPERTIES flyout, select 'Linetype'. Pick DASHED. Do the same for the other copies, setting one to be DASHED2 and the other to be DASHEDX2. Notice the differences between them, and remember the most important part: they are all at linetype scale=1.
So, my recommendation is to pick a different linetype. Different ones are for different uses. Unless you are specifically asked to use one or the other, due to a CAD standard or customer request, I'd just go with one that presents you with the least fuss.
Because, you're on the edge of a rabbit hole, and don't even know it. There are a zillion ways to do any one thing in this software. With linetypes alone, you could:
change LTSCALE
change PSLTSCALE (if plotting from paperspace)
give it a different linetype in the LAYER settings
give it a different linetype as an object property (that is, by changing things in the PROPERTIES flyout)
give it a different linetype scale as an object property (that is, by changing things in the PROPERTIES flyout)
actually re-code the linetype by editing the ACAD.LIN file (not a great idea though lol)
Can you go through this little walk-through, and let us know whether it went for you as I outlined here? I set this up using the drawing you posted, so it should all be the same for you. Please post back if you have questions. And remember HELP is your friend. It's actually pretty good for ACADE.
Hope this helps,
Jim
Jim Seefeldt
Electrical Engineering Technician