85 300ZX base model bad alternator? - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 11 (permalink) Old 08-11-2011, 10:26 AM Thread Starter
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85 300ZX base model bad alternator?

I think I already know the answer that my alternator is dying, but I thought I would throw this out there.
The battery warning lamp always stays on. Any additional load (light, A/C, wipers) will have it glow brighter. It also will glow brighter when the engine revs are higher.

The battery is new, shows a solid 12V at rest. Car is running fine. Could that be this issue? The voltage meter on the dash stays around 13-14V when the car is running. Car has 170k miles. Thanks
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post #2 of 11 (permalink) Old 08-11-2011, 06:15 PM
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Re: 85 300ZX base model bad alternator?

It's because the alternator is dying. DUH!

How much more confirmation do you need?

REPLACE THE ALTERNATOR ALREADY.

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post #3 of 11 (permalink) Old 08-11-2011, 09:01 PM Thread Starter
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Re: 85 300ZX base model bad alternator?

Cash is tight my friend. Cannot afford to second guess.

Could have done without the DUH though.

Thanks for the confirmation.
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post #4 of 11 (permalink) Old 08-11-2011, 09:28 PM
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Re: 85 300ZX base model bad alternator?

http://www.az-zbum.com/information.warning.lights.shtml


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post #5 of 11 (permalink) Old 08-12-2011, 05:02 AM Thread Starter
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Re: 85 300ZX base model bad alternator?

Awesome link, Thanks AZ
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post #6 of 11 (permalink) Old 08-21-2011, 04:12 PM
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Re: 85 300ZX base model bad alternator?

I use that 84-86 300ZX alt. in my 78Z. Yes, and eventually, given enough YEARS it will go bad. What was the question, again? ( "This alt is one bad "shut yo mouth!") Norm K.

I once worked at a real Datsun dealer. Training at Nissan Gardena was the best any car dealer had, in my opinion. Norm K.
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post #7 of 11 (permalink) Old 08-21-2011, 06:44 PM
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Re: 85 300ZX base model bad alternator?

don't want to guess. take car to battery shop. they will test your charging system for FREE! then you know for sure DUH

86T, 350 Nismo 08 (#1415) gone but fondly remembered 81T, 83T, 83, 85T, 86T, 96TT
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post #8 of 11 (permalink) Old 10-01-2011, 05:21 AM Thread Starter
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Re: 85 300ZX base model bad alternator?

Roger, get over your ego and immaturity. Nobody cares about how much an a-hole knows. DUH!!!

Anyway, it took 3 alternators to get a good one and the second one was a Hitachi. Go figure.

Runs like a champ.
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post #9 of 11 (permalink) Old 10-01-2011, 03:59 PM
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Re: 85 300ZX base model bad alternator?

Yep. All too common. ALWAYS have rebuilt parts (alts, starters, etc) tested BEFORE you purchase. All too often, there are parts that are bad right out of the box.

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post #10 of 11 (permalink) Old 10-02-2011, 07:21 AM Thread Starter
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Re: 85 300ZX base model bad alternator?

The thing that sucked was that the first one worked great for 20 miles then whined and grinded like it lost all bearings.
Second one was tested and the voltage regulator part of the alternator was drawing current from the battery after it was installed with the key out. That one had my mechanic scratching his head in disbelief not wanting to finally conclude the new Hitachi alternator was bad. It was.

Replaced that and finally 3 is a charm. I hear you on certain parts to be tested. Never want to do something twice if it can be prevented.
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