Don't know about the Merc trim senders, I have fixed my OMC one a few times, but the low voltage reading on the dash gauge is probably either an old, internally corroded gauge, or the terminals and connections are oxidized or corroded and need to be cleaned off. I have the same problem with mine, it will read 12V when the batteries are both at 14.2V. In fact I had an issue with the batteries a few years back, the gauge was reading normal, but the old alt was actually overcharging them! (gauge said 13.5 but batteries read 15.5v). Replaced the alt a few years back and no more troubles with the batteries.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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