Hard starting, and a wire that was too small
The concern
The vehicle was consistently hard to start.
What the customer suspected
A weak battery or a defective alternator.
The diagnosis
Testing showed faulty wiring between the alternator and the battery that prevented proper charging. The alternator tested good.
The contributing cause
An undersized aftermarket wire had been installed instead of wiring that meets the manufacturer's specifications.
The repair
We replaced the inappropriate wire with correctly specified wiring. The alternator did not need replacing. Because the battery was aging, we also recommended replacing it as a preventive measure, especially with colder weather approaching.
Customer benefit
Replacing the battery and alternator without correcting the wiring would not have resolved the underlying charging fault. The customer avoided replacing an alternator that tested good and learned about the aging battery before cold weather.
This repair is one of three told in Don't Just Fix What Failed. Find Out Why It Failed.
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