You need an amp clamp meter to follow where the power is going. Sounds to me like one or both of your batteries have turned into more of a resistor than battery. Meaning, they will keep sucking the power from the alternator without getting the voltage up. Anytime we have a vehicle come in that needs an alternator the batteries and current get checked with the new alternator. A good battery will charge up in short order and let the alternator amps fall back. Bad batteries will just keep taking what the alternator will put out. A whining alternator when the battery should be charged is another indication of a "resistor" battery.
Never saw this condition until about 8 years ago. Rumor has it the EPA required a change in metals in batteries. As to your charge through circuit to trailer, is a different can of worms.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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