If the fuse falls out it probably isnt in the right place. Fuse boxes have extra spaces in them that arent used...they get left open for options that may be available but aren't installed on your vehicle. Can you see the metal contacts where you are putting the fuse in? To know what it is you should see...pull out one of the other fuses and look at it to compare.
There are two power sources for the factory stereo, a constant and a switched (power when the key is turned on). The constant power is 'usually' also the one for the cig lighter or the interior light. Do they work?
The switched power is the fuse labelled as radio. There may also be one under the hood in that fuse box...look there also.
Also not every black wire is your van is a ground... best option is to attach the ground wire from the new stereo to the metal under the dash. If in doubt if it a good ground use that voltmeter to check it out.
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