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Re: 1994 J30 Alternator
Should not be a problem. Your engine is the VG30DE, which is the same engine in the 90-96 non-turbo 300ZX. On those cars, the alternators were all interchangeable, so I see no problem with using an alternator from a different model year than your car.
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Give the battery a boost. If the car starts and stays running, chances are the alternator is ok. If the vehicle will not stay running, once boosted, there will be a charging system problem. Possible alternator. If the battery is more than 5 years old, it can also cause problems as the life expectancy of a battery is 5 yrs. Very doubtful you have a starter issue. I would bet on a battery or alternator/wiring issue
Does the battery light work when you switch the ignition on? This provides a live feed to the alternator via the ignition bulb, the rotor needs a live feed to start the charge process, if the bulb has blown it won't charge (thin wire connected to the IND on the alternator). To check for a power drain, disconnect the negative battery lead put a AMP meter in series, (DON'T TRY TO START, YOU WILL BLOW THE METER). If you get a reading above 0.05amps (clock) you have a drain, pull the fuses one at a time and watch for a drop in the meter reading. Hope this helps.
when you see the starter,it looks like two round things,one big and small one ontop.tap tree times whit small hamer on the small,round thing and see if it starts.if it does change starter. coils are worn out
If necessary, remove any splash shielding for easier access to the alternator
Tag and disengage the alternator wiring. It may be necessary to remove the alternator and mounting bracket from the vehicle as an assembly.
If equipped, remove the front alternator assembly mounting plate.
Unfasten the alternator mounting and pivot bolts and remove the alternator.
If installing the original alternator assembly, push out the pivot bushing as illustrated.
These are the removal instructions per Chilton's Auto repair guide. Here is a link to help replace the drive belt when you're done. Just insert the year,make,model and engine to get the belt part number and the "Routing diagram".
Best of luck on your repair.