2G Charging Issue?

[plcooke87]

I drove my car (98 Mitsubishi Eclipse GSX Automatic) to get inspected the other day. They were busy and the car idled for 45-60 mins in 100 degree temperature with A/C on blast. Afterwards, driving down the road the gauges illuminated random indicator lights (SRS, RPM dropped to 0, other lights flickered that I don't recall). Then the car died. I was able to jump it but it immediately died after removing jumper cables.

I charged the battery on battery tender (fully charged next day I checked). I replaced the alternator with a brand new Duralast 90 amp (not refurbished). I took the old alternator to get bench tested. It passed two test at AutoZone.

These are the number I'm currently (with new Duralast alternator) receiving with a multimeter off the battery:

Not Running - 12.6V
Running - 14.1V
Load - 12.3V
2000 RPM with Load - 13.4V
Not Running After Turning Off ( A few seconds later) - 12.5V

Any recommendations?

 

[Buddy2]

Old altenator could very well be toast. Our exhaust manifolds literally fry altenators and they stop functioning while getting hot in the car yet work again once cooled off.

 

[plcooke87]

Old altenator could very well be toast. Our exhaust manifolds literally fry altenators and they stop functioning while getting hot in the car yet work again once cooled off.

The old alternator tested good off the vehicle.

Don’t I have a problem if I only have 12.3V under load?

 

[Buddy2]

You could clean your grounds and try with another battery on in the car. im not electrician but while car off id expect to see battery around 12.6+ volts and when running somewhere between 13.5-14.2 volts. you can also try to turn headlights and stuff on while cars off and measure the voltage of th battery or take car to sparepart shop and make them to measure the battery to see the condition of the battery.

The old altenator could pass the test while cold but once it gets hot due the exhaust manifold heat and stuff just stop charging, iv had this issue in the past and the altenator welds are in very bad heat from the exhaust manifold. One altenator i killed pretty fast without the heat shield on the lower part of the manifold once.

 

[Xarzor]

Check and make sure the wires from the alternator are hooked up to the battery and that you're getting voltage from the alternator while the car is running. If not make sure you don't have a broken wire from the alternator to the battery. Try doing a continuity test.

 

[AWD-Tony]

Voltage drop test

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