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So my 95 base model 3000gt recently died while I was driving on the highway, a cop stopped, jumped my car and it held a strong battery till about 12 hours later. I then saw my gauge start to drop as I was doing daily errands, my car was accelerating very slowly and after I parked it again and turned it off, it wouldn’t crank. Is this a battery issue? Wiring issue? Or do I need a new alternator? Thanks in advance!
 

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Lovbyts
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LOL, you are expecting a little much via diagnosis from online. Get your batter tested #1. Check the cable connections to the battery and alternator. You can take the alternator to get tested or us a volt meter to see how much its putting out or drive your car to the auto parts store and have them test it in your car for you.
 

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So my 95 base model 3000gt recently died while I was driving on the highway, a cop stopped, jumped my car and it held a strong battery till about 12 hours later. I then saw my gauge start to drop as I was doing daily errands, my car was accelerating very slowly and after I parked it again and turned it off, it wouldn’t crank. Is this a battery issue? Wiring issue? Or do I need a new alternator? Thanks in advance!
check your battery, check your cables. what i sometimes do is unhook the battery while cars running, if the alt is good it should run for a while. just be aware that it may ruin electronics this way, however i've done it lots and never had any issues.
 

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Panama Green,mostly stock with 13G's, Oohnoo SMIC, money pit
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unhook the battery while cars running, if the alt is good it should run for a while.
Never unhook the battery intentionally while the car is running.

The chances of creating a voltage surge and damaging some electronic component are large. The battery acts like a capacitor and keeps the voltage stable. You are correct the car should keep running but proper trouble shooting is the way to go here.

It sounds like the alternator is intermittently failing to output correctly. Get a voltmeter and put it on the output terminal of the alternator. It should be between 13.8 and 14.7 preferably close to 14.4. Check at the battery and it should be same or slightly lower.

If you are seeing intermittent voltage loss from the stock voltmeter most likely alternator not charging. You could if you had your meter stop and check the alternator at that point.

p
 
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