Alternator Replacement - Mk1 NA into Mk2 NB Swap How To | Supercharging an MX5 Miata Ep 10

[@FastRust]

Will this mod work?? Check out the next Episode to find out : kzbin.info/www/bejne/pnbJlZqng6uinLc

[@timheadford]

The only video that actually mentioned that bracket behind the unit, that has to be removed. Thank you.

[@FastRust]

👍🏻

[@demetristavrou]

Such a great video, really helped me! Only thing to note, for some reason in my case, attaching the wire to switched power would cause the battery to drain overnight. The solution for me was to attach to constant power, and now battery no longer drains!

[@garethlittlewood6344]

Hi James, just stumbled across this series and wanted to say it's awesome! Planning on doing pretty much exactly the same to my 1.8vvt mk2.5 later this year!

[@FastRust]

Cheers Gareth! Great to hear. I'm aiming to keep a steady stream of these videos coming out over the year. Should be helpful for guys like yourself 👍🏻

[@alesyis]

thanks for the video , i change my engine and the new ecu control and your video help me to understand.

[@epp9122]

Great video, just what i needed! Thanks!

[@billywhizz98]

Great video very informative hopefully it will work with the ECU

[@FastRust]

Thanks. So do I!

[@alexanderlapierre4040]

Why is there no grey red wire under my dash. Only one at that location is solid grey/then to solid red halfway through. Is that the wire you are talking about?

[@Beastgamingish]

I’m under here now thinking exactly the same thing

[@Beastgamingish]

Did you work out what was what?

[@ericmundt4]

@@Beastgamingishhey were you able to figure out which wire i’m having the same problem

[@sythenalpha2037]

are the wire colours the same on a mk2 1999 or are they different

[@ChutneyInc.]

I just replaced my alternator with q reman unit from autozone. I wish it worked as beautifully as it looked. I'm glad I didn't bother putting the intake bracket back it on. I'm ordering q used unit. My original alternator charged fine before removal its just that the bearing and the pully where both shot. I think the generic parts stores ran units don't get things right as far as thing inside the alternator that helps the ecu regulate the voltage or amperage. It's like part of an internal voltage regulator or something available from mqzda. So from a reman 210 American dollar unit from the store coming out and a 58 dollar 99k miles unit going in... by far one of my biggest headaches this car ever gave me... along with the VVT Bug. Is like this thing got the covid vac or som"n

[@FastRust]

I've heard this a few times since having my charging issue - motorfactors giving folk the wrong alternator for their gen of MX5 resulting in charging issues. I would have never have known the differences if I hadn't had my problems. I would have assumed the NA & NBs were all the same unit.

[@RetroAndRusty]

Nice tech tip! Fingers crossed it works. By the way one of the Car Throttle guys mentioned selling a similar ECU on the last podcast. Can’t remember the model of ecu though. Have you ever replaced the Capris alternator? Wondering if there is a cheaper alternative (like the Mazda)than the ones on eBay?

[@FastRust]

Thanks mate. Fingers crossed I wont have to buy another after this mod! Bloody hope not anyway. Yeah I've gone through 2 alternators in the Capri, think I got them both from the local parts store as an exchange deal. About 75 quid? Something like that. MX5 reconned are similar price. If they fit the bracket it might work. You'd need an early unit though with the voltage reg and the pulley for a V belt (mk1 1.6).

[@PK-pt3qq]

- W sumie to piszę tylko po to, byś miał dodatkowy komentarz :) - Ja kupiłem w Polsce nowy alternator do NB - podłączyłem i stwierdziłem, że nie działa (był tani - 260zł - to chyba mniej niż 50 funtów..)... ..Mam też Mazdę NA, więc porównałem i się okazało, że przysłali mi właśnie alternator do NA - sprawdziłem multimetrem czy są różnice i gdy zauważyłem, że są, to pozamieniałem kable, by alternator działał w NB... ..Teraz z ciekawości zaglądnąłem do internetu, by się dowiedzieć czy w mojej MX-5 NB ktoś coś namieszał, czy oryginalnie różni się podłączenie od tego w NA - i jak widzę - oryginalnie jest inne... - Pozdrawiam :)

[@mircob.9359]

hello, I too have problems with the ECU (I recharge it at random 12.4-15v) what is the difference between the two alternators? can i use my mk2,5? is the recharge done to you with the right need for the battery?

[@FastRust]

12.4 - 15v sounds about right to me

[@mircob.9359]

@@FastRust not for my acid battery. It throws the acid out of me, in fact I'm not using the car

[@GmoLargey]

Feel your pain, my ms ECU started giving me grief a while back, found it was voltage regulator, ECU was repaired but years after its back, ended up swapping in MK1 alternator, only gripe I have is the aem wideband displaying 'battery' on cranking, guess that's just because ECU isn't in the loop anymore

[@FastRust]

Hey Aran. Yeah it seems like I'm not the only one to suffer from this issue. Mazda should have left the bloody reg in the alternator where it's meant to be! I don't get your wideband issue though. Are you on an older gauge?

[@FastRust]

Your name has cropped up a lot recently as the guru of all things mx5 supercharged related. Lovely car, checked out some of your videos 👍🏻 May have a question or 2 for you down the line.. when I get my mount kit!

[@gustavogodoy144]

I HAVE PROBLEMS WITH MY NB 2003, I REPLACE THE ALTERNATOR AND IT DOES NOT CHARGE, THE ALTERNATOR ON THE TEST BENCH DOES WORK 14V, BUT IN THE CAR IT DOES NOT TURN OFF THE BATTERY BULB AND THE ALTERNATOR DOES NOT WORK

[@FastRust]

I've heard this issue time and time again now. Even with stock ECU. I'd just sling a mk1 alternator in it and be done with it

[@sarammika]

hey mate. I've just finished changing a voltage regulator in my mk2, by installing one meant for mk1. modified the wiring aaaaaand..... battery light stays on despite car charging 14V like it should... any ideas?

[@FastRust]

Stock ECU?

[@sarammika]

@@FastRust for now. going Link StormX soon

[@FastRust]

Hm I'm not sure to be honest with you. My light operated like normal after the mod, even with the stock ECU. Only thing I could suggest is recheck the wiring side of things?

[@sarammika]

@@FastRust I think the mk2 alternator circuits didn't like the mk1 regulator... well, I'm gonna be test fitting r32 gtr alt tomorrow, also looking for a similar alt from 2.8d Pajero, and I have new mk1 alt coming Wednesday just in case... wiring is definitely a-ok.

[@FastRust]

Plenty of options! Hope you get it sorted.

[@ziyakucuk4082]

👍

[@Essin62]

Sigh of relief...

[@FastRust]

Providing the ECU works 🤞🏻