Alternator Not Charging Properly in JMC New Boardin

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Alternator Not Charging Properly in JMC New Boardin

Many JMC New Boarding owners in Pakistan report that the battery warning light appears on the dashboard o r the vehicle suddenly loses electrical power. What are the most common reasons the alternator stops charging properly in this model, and how can owners diagnose whether the issue is with the alternator, wiring, o r voltage regulator?

Talha Kyanii asked on 29 Nov 2025 10:00:25 am

1 Answer

13 views |

Gari Master - on 29 Nov 2025 10:16:52 am

Inside the alternator, there are carbon brushes that pass electricity from stationary to rotating parts. Over time these brushes wear out. If they wear too much the alternator cannot generate enough current — so battery does not get charged properly.
AutoTechIQ
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Car From Japan
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The belt o r pulley driving the alternator may be loose, worn, cracked, o r slipping. If belt doesn’t turn the alternator at proper speed, output s dramatically and charging fails.
Ackodrive
+1

Internal damage — e.g. to rotor, stator, windings, o r diodes/rectifier — can impair generation of electricity. That means the alternator housing seems fine from outside, but output is weak o r erratic.
CarDekho
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Car From Japan
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Electrical-side problems: poor, corroded o r loose wiring o r grounding, bad connectors o r fuse/relay issues — even if alternator mechanically works, electricity might not flow properly to the battery.
AA1 Car
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Automotive Gearz
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How to diagnose:
With engine running — measure battery voltage: it should be around 13.8–14.5 volts if alternator is charging correctly. If it stays near battery-resting voltage around 12–12.5 V o r s under load lights, AC, etc., the alternator o r its drive/connection system is likely faulty. Also inspect belt tension/condition and check for loose/corroded wiring o r terminals.