92 Infiniti G20 Electrical Problem?

Question

92 Infiniti G20 177k Miles Electrical Problem?

As I was driving, three dash lights came on: Battery, Antilock Brake, and Parking Brake. I drove the car another 50 miles to get it home. After about one half hour of driving, the three lights began to flash off and on. Each time they came on, the engine revved up. If I turned on the lights or the heater, the flashing and the engine revving would happen more frequently.

At home, I found the battery would only charge to 9 volts, and the alternator had no output. I will replace the battery and the alternator, but I worry that the odd combination of flashing lights and the revving up may indicate other problems. The CEL never illuminated but I will take it to AutoZone for a code scan.

Does anyone have an opinion as to the reason for the triple set of flashing lights and the revving up condition. Thanks for any insights.

Rodan.

Mike · Accepted Answer

Charging system failure. The battery and parking brake come on when the  charging system fails to get your attention. The ABS light most likely came on  due to low voltage sensed by the ABS computer.

zzyzzx · Answer

Why are you replacing the battery?

Hal · Answer

Assuming the alternator is working, it is putting load on the engine. It converts mechanical energy into electrical energy. As soon as it drops out, the load will go with it and thus your idle speed may very well jump up.

As far as the warning lights go, it is not uncommon to have various warning lights tied to the charging lamp. When you turn the key to run without the engine running, the charging system light will illuminate. It may also light up other lights as a bulb check at the same time as a result of the alternator lamp being on.

I'd say change the battery and the alternator, and perhaps the alternator belt, and keep on driving.

Good luck with it.

Chris

zzyzzx · Answer

I'd rebuild the alternator and install a voltmeter gauge in the car. I would not replace the battery unless it's 5 years old or older.

92 Infiniti G20 Electrical Problem?

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