Buy another voltage gauge(can just be a digital voltage gauge off amazon), and tap into the line right there at that existing gauge. That will allow you to determine whether the voltage line is actually dropping, or the existing voltage gauge itself is bad.
Gauge bad, find a dash gauge to replace it.
Line voltage dropping, follow the wiring back to the source to determine where the problem is.
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DaveB, Raleigh, NC
2015 Tiffin RED 33AA, w/Honda CRV
VMSpc, Magnum BMK/ARC50
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