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As a rule of thumb:
Voltage drop from the positive battery post to your alternator [@power outlet] should not be more than .3v
Voltage drop from the alternator housing/casing to your negative battery should not be more than .2v
.5 together is max allowable drop between the two.
Edit:
If you do have more v.d than max allowable then these guys are correct, high resistance is bigger v.d is corrosion or a break in the line. Corrosion most likely.
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The thing is, it’s a gearbox, okay? It has one job to do! One job! Pull the lever… ‘Am I a pencil? Am I a cauliflower? Am I a nuclear power sta– I’m a gearbox! Oh, heavens, I’m gonna swap some cogs around!’
Jeremy Clarkson on Automatics
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