viriiguy

iTrader: (1)

Ok.. So it not working then shouldn't have anything to do with the Alt. not charging. I read on a thread on this forum that the alt. required 12 volts across that to charge... I think. Which is why I was looking into it.

aidandj

iTrader: (5)

<p>I was wrong. Under 14 volts field should be equal to the 12v source. So you need to adjust the pot.</p><p>Hold on I'm figuring out which way to turn it.</p>

aidandj

iTrader: (5)

<p>Turn it clockwise until it starts charging.</p>

viriiguy

iTrader: (1)

Ok, I will try again... But when it was showing 12+ volts, it still wasn't charging. LEt me go try it again and I will report back.

aidandj

iTrader: (5)

<p>Throw the battery on a charger and get it nice and full.</p><p>Then try again with a fully charged battery. Adjust the pot until its charging at 14.4 volts. Counter-clockwise=lower. Clockwise=higher</p>

viriiguy

iTrader: (1)

Yea I have it so it is reading 11.87 right now. As high as it's going to go. And it isn't charging. My battery it pretty low at this point so I will put it back on the charger.

Braineack

iTrader: (62)

yeah, that suggests the alternator is not coming on.

viriiguy

iTrader: (1)

Yea, I fully charged the battery... still not charging. So I will take the alternator off, take all three alts. that I have, get them tested. and go from there.

viriiguy

iTrader: (1)

Well, all three of my alternators test as good. Both NB's and the NA. So back to the drawing board.

viriiguy

iTrader: (1)

Well the moral of the story is don't let me solder without my glasses. I soldered it to 1Q instead of 1O. It works now. Thank you everyone for trying to help and sorry I wasted your time.

Braineack

iTrader: (62)

;p it happens.

viriiguy

iTrader: (1)

Getting old sucks

arga

I finally got a chance to test this on the bench. Works perfectly. Thanks Frank.

WestfieldMX5

good job, thx for letting me know

arga

I know this is a stupid question but I don't want to fry anything. Do I need a pull-up or a transistor isolation circuit for the Disable line or can I run a line straight from JS0 to the Disable pin on the Alt Ctrl board? If I need a pull-up, do I need a 5V or a 12V?

Thanks

WestfieldMX5

no pullup needed, to stop charging, just ground the disable line.

Savington

iTrader: (31)

Still have several of these. We used them to control the alternator on our NB EMS-4 product, so they can be used for just about anything that doesn't have onboard alternator control.

https://www.miataturbo.net/miata-par...9/#post1322298

aidandj

iTrader: (5)

Having a possible issue with the board. Figured someone might be able to help.

Its been working great for like 8 months. But just recently the alternator started skyrocket to like 16 volts when doing pulls.

Bad alternator? Bad board?

Is there a way to check?

Matt Cramer

Check the voltage output of the circuit. If it's pegged at 5 volts, bad regulator. If it's at 0 volts, the regulator is trying to shut down a runaway alternator and the alternator isn't listening.

stefanst

iTrader: (1)

I believe Frank's board takes it up to 12V, so if the output is 12V (or higher) during a voltage spike, there's a problem with the circuit. If it's 0V there's a problem with the alternator.