An alternative source could be the engine earth strap!
Years ago I had a Fiat Mirafiori that refused to start; I became adept at starter motor removal and replacement but couldn't work out what the problem was as the starter was fine when off thecar.
It turned out that the earth strap between the rocker cover and bulkhead had an air gap. Remade with aircraft-specification braided cable and - problem solved.
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loki_the_glt - Skipper of the Exxon Valdez, driver of Sweden's finest sporting saloon - and pining for another Slant-4.
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