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Alternator replacement, now the negative cable?

andyvh1959

Well-known member
Joined
Feb 15, 2020
Messages
2,590
Location
Green Bay WI
My 2019 Kia Sorento recently crapped the alternator, totally. Car went dead while driving, everything deae. Got it towed home. I replaced the alternator, $250 from CarQuest. Not a pleasant changeout; PS tire off, fender linder out, serentine belt off, AC compressor out (hoses connected) and then finally the alternator comes out. Some dumb *** deisgn made access to some bolts very difficulr. Got the new alternator in, hooked up and the car fired right up.

Voltage at battery reads 12.5v. Car running, 13.7v at idle, 14.3v at raised rpm. But the battery indicator light stays on. Many restarts and some short trips today, car starts/runs fine, but the battery indicator light stays on. Serpentine belt is good, tensioner is very strong, idlers good. LED Voltmeter in a power outlet inside confirms battery voltage consistent at 14.3v. So do I need to replace the negative sensing battery cable? Aside from continuity how would I test the negative sensing cable?

Oh, and if you do this alternator change, use a safety strap around the alternator as you jostle into position. I didn't at first and it dropped out onto the concrete floor, right onto the threaded lug of the plastic cover and lug for the exciter connection on the podded voltage regulator, breaking open the casing. I found a voltage regulator from Valeo on Amazon, another $60. Local Kia dealer wanted $318 JUST for the voltage regulator.

 
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Cheep

Well-known member
Joined
Sep 19, 2025
Messages
63
Location
USA
That indicator light is triggered by the alternator, unplug the harness at the alternator and the light should go out, if it does, check the fuses as there should be one for this circuit.
 
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