Braineack

iTrader: (62)

my test was always turning on headlights and a/c at the same time I was dropping bass through my 500 watt amp.

Reverant

iTrader: (10)

It will require hardware modifications and will require 2 output ports.

Schuyler

iTrader: (1)

For clarity sake, on a 99-00 would that be ECU pin 1T for the field line, and 1O to read the voltage?

JasonC SBB

Cool. That will regulate to within ~0.2 V from no load to full load, with very fast transient response. And if one wanted to have even more accuracy, put a PI loop on top of it.

BlackBandit

iTrader: (2)

How are you wiring the alternator so it doesn't spike 14volts?

Ben

iTrader: (33)

Confusing question is confusing.

BlackBandit

iTrader: (2)

The alternator is currently charging 18v. It's not good at all. I just installed the ms3.
It should be 1 wire will have a 12V feed and the other will be control (ms) but which one is which?

Braineack

iTrader: (62)

wtf?

I'd start by wiring it correctly, then tuning it correctly.

BlackBandit

iTrader: (2)

We are working on the wiring before we tune atm. The voltage is what's stopping us.

Braineack

iTrader: (62)

Well if you're using MS to control your voltage, and you haven't tuned it, how do you expect it to get correct in the first place? Are you using the 1.3.2 firmware with the "Miata" control method?

BlackBandit

iTrader: (2)

Everything is running properly. Fans, ac, idle. It's the voltage that were receiving out of the alternator is what's scary.

Braineack

iTrader: (62)

how are you controlling it?

Braineack

iTrader: (62)

I'm assuming it would be:

1O field out - spare PWM output.
1Q charge indicator - spare medium/high output (like inj e-f-g-h)

I'm also assuming that 1Q is optional if you don't want a low voltage indicator.

1T is a input/ground from the alt. to the OEM ECU to let it know the alternator isn't functioning (something to that matter), it is unused.

Ben

iTrader: (33)

The Mazda diagram is kind of confusing. 99/00:
Alternator field is 1O
Alt sense is 1T

01/05:
field is D4
sense is E27
Where D is the 24 pin plug and E is the 31 pin plug

BlackBandit

iTrader: (2)

I appreciate it. Hoping this will help.

Schuyler

iTrader: (1)

So I will be simply hooking the alternator field wire from 1O to the nitrous 1 pwm, using the exact settings posted in Ben's first post aside from changing miata to the renamed "high speed" setting, and changing the output to nitrous 1. Correct me if I'm wrong, otherwise I'll post the result. lol.

Braineack

iTrader: (62)

are you even using 1T, you'd hook it up like I suggested in teh post before yours, correct?

stefanst

iTrader: (1)

Moderators:
Should we move this over to the Megasquirt subforum?

WestfieldMX5

PWM outputs supply ground, so me thinks you need to add a 12V pullup.

Ben

iTrader: (33)

5V pullup, but otherwise correct.

No, wire it like my post.