Fuse #2 is original radio circuit. If the wipers work, then the fuse is good. An updated radio with memory and clock requires addition of a direct connection to the battery, usually with an inline fuse.

Even if the fuse looks good, there could be an intermittent problem due to corrosion at the contacts. Clean up the fuse holder and replace the fuse. If that doesn't fix the problem, then you'll probably have to trace it out.

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'79 240D