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Jun 5, 2023 at 16:39 history edited ppeterka CC BY-SA 4.0
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Jun 5, 2023 at 12:42 answer added MTA timeline score: 1
Jun 5, 2023 at 7:25 comment added ppeterka @MTA Thanks - cleaned all connectors and conductive surfaces and even applied contact cleaner spray. Also, checked the battery voltage at the clamps, and even with two batteries in parallel, it drops very low when cranking. Also, if I crank long enough, the - reasonably thick - wires do get really hot, so there is very significant current flowing. I even checked the ground cable to the engine, that seems to be in good shape too. I suspect either the starter motor, or something else has gotten mechanically stuck. Or the starter motor has developed fault resulting in high current and low torque.
Jun 4, 2023 at 22:21 comment added MTA Do you know for sure that the battery posts and battery cable clamps are clean and tight? For example, if you removed the battery for charging, then cleaned the contact surfaces of posts and clamps before reassembly and properly torqued the clamp fasteners, they're good. If not, suggest you do that before further diagnosis. Also, a voltage reading at the battery during cranking will go a long way toward solving this mystery.
Jun 4, 2023 at 20:05 history edited Pᴀᴜʟsᴛᴇʀ2
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Jun 4, 2023 at 19:41 history asked ppeterka CC BY-SA 4.0