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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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