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Amedee, Oldsmobile Technician
Category: Oldsmobile
Satisfied Customers: 26257
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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Arorua 4.0, new alternator putting out over 17 volts.

Customer Question

arorua 4.0, new alternator putting out over 17 volts. regulator changed out twice. Checks ok on test but in the car it puts out high voltage
JA: Have you checked all the fuses? Do you have a wiring diagram?
Customer: I do and the one marked thermistor is ok visually
JA: What is the model of your '17 Oldsmobile?
Customer: it is a 98 Aroora, 4.0 northstar
JA: Are you fixing your 98 yourself? What have you tried so far?
Customer: The alternator went out so I removed it and had it rebuilt. When it started the overcharging, I took it back out and back to the rebuilder. It checked ok on his bench but he replaced the regulator antway. Said that the thermistor might be the problem
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 7 months ago.
Category: Oldsmobile
Expert:  Amedee replied 7 months ago.

Hello and welcome!

My name is ***** ***** I can assist you with your question.

Expert:  Amedee replied 7 months ago.

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Expert:  Amedee replied 7 months ago.

On the positive battery cable there is a thermistor to sense battery temperature. This is likley the root cause of the overcharging condition. Disconnect it and jump the Orange and Light Blue wires together, then see if the alternator charges normally. If so, the thermistor is bad and will need to be replaced.

Expert:  Amedee replied 7 months ago.

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