Car wont start but batterys good
A fully charged battery does not mean that its amperage output is adequate, have it tested at an auto parts store. While your problem could be battery, wiring, key switch, solenoid, starter or maybe really cold outside, best to start with simplest first, clean the battery terminals and cable connectors with a terminal brush tool and install anti-corrosion impregnated felt rings on each terminal. With the battery terminals disconnected, also unbolt and clean the solenoid and starter terminals too and re-tighten. Then find the "ground" connections from the negative battery cable to the metal chassis and from the engine to the chassis, unbolt, clean, sand clean each if necessary and reinstall. If when using a voltmeter there is any reading between the engine block and the negative terminal of the battery, installing an extra ground cable directly between the engine block and the negative battery terminal connector. When reinstalling battery terminals, install positive terminal first, place socket slightly larger than battery terminal on top of it and lightly tap to fully seat the cable connector on the battery terminal before tightening. Tighten snug enough that cable connector does not move on the battery terminal, do not over tighten. Beware of battery acid and accumulated corrosion, wear eye protection and protective gloves too and be aware that battery acid eats holes in clothing and cloth gloves. If problem persists, a DC voltmeter most useful to determine if when key turned to start, there is voltage applied to the solenoid. If yes, then to check if solenoid operates upon key turn to "start" applying voltage through solenoid to starter. If yes, and if battery amperage output tested "ok" then starter may need to be replaced.
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