The RED wire you mention is the power source for the controller and display unit... it routes directly to the battery and has an inline fuse
Have you removed the red wire connection at battery and cleaned it and verified the connection is good... also I remove fuse and inspect fuse socket and make sure there is no oxidation on it or the fuse
With two GC2 batteries properly charged that system should never drop below 12 VDC... my hydraulic system maintains 12.1 to 12.3 minimum during operation of leveling system even in 20 degree temps when load draw due t9 cold hyd fluid is quite high
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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