Take a voltmeter set on not less than 20 volts dc scale and connect it alone to the battery 1st and read the voltage. The battery should read about 12.4-13.0 volt if charged. If it reads less 12.4 than it is not charged or could have a bad cell. Next put the volt meter across the battery charger leads only and it should read about 13.5 - 20 volts dc. If the charger leads do not read in the range listed, the charger is probably bad. If the charger leads read in the 13.5-20 volt dc range connect them to the battery and leave them on for 1/2 - 4 hrs min charge(depending on the battery charger size and battery charge state). After charging the battery for the listed time, remove the charger leads and the battery alone should read about 12.6-13.0 volts dc; a reading lower than 12.6-13.0 volts indicates a bad battery or a malfunctioning battery charger.
Possible suspects are:
1. A severely drained battery.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
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