348 NP alternator output

Does anyone know (for certain) the correct output for the Nippondenso alternator? I see several posts by "308GTS" surmising that it is 140amps. Can anyone confirm this?

Regards,
Dave

From the Shop Manuel...GM - 105 Nippo - 120

Thanks JRV, his alternator is working (recently tested) and putting out 100amps. Facility says it is working fine....so either he somehow got "exchanged" with a lower output one at some time in the past (it has been rebuilt at least twice before), or the shop does not realize the correct output should be 120amps.

The symptons is that at idle, when the radiator fans kick in, the "batt" light flickers, and on voltage meter, he is dropping to the low end of the "acceptable" range...obviously not keeping up with the needs of the car.

>>The symptons is that at idle, when the radiator fans kick in, the "batt" light flickers, and on voltage meter, he is dropping to the low end of the "acceptable" range...<<

Wrong (cheap) Regulator!!!

Had this happen several times before "I cracked the whip" on my Alt Guy and made him start using the 'correct' (more expensive) Heavy Duty Regulators!

RIGHT!!!

JRV, I have repeatedly told by buddy of your posts about this issue, but each time he took it to an electric shop, they said his alternator is fine...well today, he took it to the largest shop here in Seattle, and the head guy went through it with him....It indeed is a 120 amp alternator, and the amperage was fine (to spec). Voltage regulation was fine initially, but when run for a while (and letting it get nice and hot)....voltage started going all over the place, but dropping significantly under load! Bingo! Though there are several aftermaket "heavy duty" regulators, this guy recommended he stick with the factory one. Installed, and working perfectly now.

Sounds like all the other shops quickly spun it up, checked fine and returned it....inexcusible.

Thanks JRV! Everything comfirms with what he found out today.

Dave,

More people need to hear the message..."Ferraris Don't Like Cheap Parts"!!

These are very High Performance (sometimes fickle) and Picky Cars!!

There are many ways to shave the cost of ownership, but being purely cheap doesn't work all that well in many cases.

I can fix these cars as cheaply as anyone can correctly because of my experience, and there are simply certian shortcuts I won't take, because they don't work!

Thanks JRV,
But in this case my buddy was not being cheap, he was getting poor dianosis by the electric shops that were testing his alternator. It was not until he worked with the head guy at this shop in Seattle today, that he finally got a proper diagnosis and repair. He discussed your recommendation of a "heavy duty" regulator, but this experienced tech really felt the OEM factory part would be best in this instance. My buddy was willing to go along with his experience in the matter...and with the confidence that if it does not work out, he can easily buy the aftermarket voltage regulator and install it himself if this one craps out again. The tech let him know he carries the alternate voltage regulators if he needs them.

Regards,
Dave

Dave,

my Alt Guy never gave me a part # or fully explained what he meant by "heavy duty", he did tell me that the microchip in onboard system was very particular about voltage needs (which I knew from fault modes)!!!!!

He (my Alt Guy) needs to make a living too, so as long as he builds my stuff right I didn't try to cross examine or second guess him!!! But one thing I know for sure, the 348/355/360/550 Nippos &amp; Ferraris are picky and must be done exactly right!

I should add that the electrical power demands of Ferraris is quite extreme compared to most Normal street cars! These demands require that Alts perform at precise levels at all times for the car to perform at it's opitmum!.

Bottom line is, Glad Your Friend Is "Back on Da Road Again" !!