A bad crimp connection will severely limit current flow. Since the RD consumes current, the result is that the voltage to the RD drops instead. Likewise a bad ground connection will also limit current flow. Again the result is a voltage drop which is seen by the RD since the current passing through the RD is not well grounded and can't flow freely.
To check your connections, first unplug the add-a-fuse. Then use a crimp tool to make sure that all crimp connections are tightly crimped. Likewise, make sure that your ground connection is indeed a good ground. Once you have checked and re-crimped any suspect connections, plug the add-a-fuse back in and then see if your RD still displays a low voltage warning.
One final but rare possibility exists -- a bad crimp for the RJ-11 telephone style connector on end of the hardwire cable. If you decide to re-crimp this connection, only do so after you have either removed the inline fuse, or have disconnected the add-a-fuse from the fuse box, or have disconnected the hardwire's ground connection. The reason is that the metal multi-prong crimp blades within a RJ-11 crimper will short across all of the connections within the RJ-11 plug. This is why you must be sure to kill current flow by first disconnecting any one of the mentioned connections or by first removing the inline fuse.
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