You don't get a "drain" of 2 volts. Any drain will be from a flow - measured in amperes. You get a drop in volts when demand-flow exceeds what can be supplied.
If flow drains the battery, the voltage drops.
If a flow exceeds the limits of the wire and/or connections being used, voltage at the draw can drop in volts.
Also, maybe your battery is NG and the proper voltage does not exist to start with.
Check the battery no load. Then under load. Then if all checks OK - put an amp-meter between the battery and main feed wire and see if there is any current flow when nothing is being used.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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