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Old 08-28-2015, 10:55 PM   #121
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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.
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Old 08-28-2015, 10:59 PM   #122
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<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>
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Old 08-28-2015, 11:00 PM   #123
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<p>Turn it clockwise until it starts charging.</p>
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Old 08-28-2015, 11:05 PM   #124
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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.
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Old 08-28-2015, 11:10 PM   #125
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<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>
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Old 08-28-2015, 11:15 PM   #126
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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.
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Old 08-29-2015, 09:55 AM   #127
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yeah, that suggests the alternator is not coming on.
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Old 08-29-2015, 11:06 AM   #128
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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.
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Old 08-29-2015, 12:14 PM   #129
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Well, all three of my alternators test as good. Both NB's and the NA. So back to the drawing board.
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Old 08-29-2015, 02:37 PM   #130
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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.
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Old 08-29-2015, 02:49 PM   #131
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Default Interest in NB alternator circuit board?

;p it happens.
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Old 08-29-2015, 04:00 PM   #132
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Quote:
Originally Posted by Braineack View Post
;p it happens.
Getting old sucks
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Old 09-04-2015, 02:33 AM   #133
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I finally got a chance to test this on the bench. Works perfectly. Thanks Frank.
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Old 09-07-2015, 12:32 PM   #134
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good job, thx for letting me know
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Old 10-03-2015, 03:31 PM   #135
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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
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Old 10-04-2015, 05:51 AM   #136
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no pullup needed, to stop charging, just ground the disable line.
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Old 04-08-2016, 09:33 PM   #137
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Default Jason Cuadra/WestfieldMX5 V1 alternator control circuit

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
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Old 05-03-2016, 03:15 PM   #138
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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?
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Old 05-05-2016, 09:24 AM   #139
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Quote:
Originally Posted by aidandj View Post
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?
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.
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Old 05-05-2016, 09:30 AM   #140
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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.
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