Switchflicker, The best way to explain this is that your main starting battery was probably up to a fuller state of charge, so it would read a higher voltage. The auxiliary battery, if in a low state of charge requires more amperage from the alternator to bring it up to full charge. Until it gets to that point, the voltage on it will show slightly lower. As it charges up, they will equalize. Also, charging a battery for say and hour does not mean it is fully charged. The longer a battery stays at a lower state of charge, the longer it will take to bring it up to full state of charge. It will require more amperage from the charging system to bring it to full charge. Don't assume that the auxiliary battery is fully charged after say even a four hour drive after being drawn down. Especially if it is left in a low state of charge for a while, that battery should be put on a charger.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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