Not sure I can explain it either. Things that come to mind would be: 1) Voltage drop in the wire and/or any breakers or fuses and connections/splices in the line from truck battery back to trailer battery (but 2 seems a lot) 2) The trailer battery, for whatever reason, isnt achieving or maintainuing the state of charge as the truck battery. 3) A resisitve/burned/loose ground connection at the trailer.
If two batteries are in paralell one would think the voltages would be the same unless theres a voltage drop across a connection or splice or wiring or a ground I guess. If two batteries in paralell arent the same (should be matched in type size brand and age etc) one feeds off the other and thats not a good thing. Still if plugged in when driving the trailer battery should get some charge at least and as long as its unplugged when setting (or a diode) I dont see it as too serious unless excess current trying to charge a weak battery might overcurrent the charging system???
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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