The old "watch for a spark" or a test light in series won't work with the new electronics.
The only reliable test is with an amp meter. The system needs a real connection for everything to charge up and drop out, may take a few minutes for that to happen.
If the load doesn't completely go away, you can use the amp draw to calculate how long it would take to discharge the batteries. If the numbers don't add up, that leaves the batteries to blame.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [Read Article]
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