WTFFFFFF Alternator wierdness??????? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-17-2012, 07:44 PM   #1
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Default WTFFFFFF Alternator wierdness???????

I have a NB with a NB alternator.

Today, I swapped alternators because I saw signs that my alternator was dying or weaksauce as indicated by voltage drop under boost.

So I swapped, and took a drive and logged. The new alternator worked great. I stopped to look at the logs and voltage was nice and stable around 14v instead of dropping to 12v.

I peel out and the car starts to miss and run like shi. I pull over and look at my EMS display and see voltage is now at 10.5v I pop the hood and see oops, the battery strap on the alternator fell off because i didn't nut it down.

I fire the car up again and drive off, and despite the strap being attached, the voltage is still 10.5v


WTF????? I have dyno day tomorrow and need to fix this now.
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Old 02-17-2012, 08:01 PM   #2
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sawzall it off
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Old 02-17-2012, 08:25 PM   #3
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Alternator needs more turbo.
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Old 02-17-2012, 08:33 PM   #4
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Quote:
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Alternator needs more turbo.
turbonator?
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Old 02-17-2012, 08:48 PM   #5
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I have a spare NB alternator. $5000 and you pick up?
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Old 02-17-2012, 09:35 PM   #6
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that's a steal have him tip you with a *******
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Old 02-17-2012, 09:50 PM   #7
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If you ran for a while off the battery, it'll need to charge, usually 10-20 minutes of driving with a good alternator will charge a battery that barely started the car a few minutes earlier.

Throw the battery on a trickle charger over night and see if it changes.
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Old 02-18-2012, 12:26 AM   #8
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Fae bring the car to the dyno and we can throw a battery charger on it while it runs.lol
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Old 02-18-2012, 02:50 AM   #9
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Swapped the nb alt for na alt.

Blah. This self regulatig alt sucks.

When i turn on the lights, voltage drops by .5. Turn on blower and same thing happens.

13v steady my ***.

For the one minute my nb alt worked voltage was steady at 14v even with lights on. Sigh.
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Old 02-18-2012, 11:27 AM   #10
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seriously I do have a spare alternator. not really for $5000.
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Old 02-18-2012, 12:10 PM   #11
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didnt we tell you the NA ALT SUCKS?
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Old 02-18-2012, 12:15 PM   #12
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Quote:
Originally Posted by y8s View Post
seriously I do have a spare alternator. not really for $5000.

Quote:
Originally Posted by Braineack View Post
didnt we tell you the NA ALT SUCKS?

Argh damn it. In an attempt to make my dyno day i did rewire for the NA alternator. It can be undone, but ugh.

I hope the RX7 alternator doesn't suck because I think I will go to that.
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Old 02-18-2012, 12:17 PM   #13
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weeks before dyno = do nothing, car runs ok
day before dyno = hey lets swap parts and re-wire stuff

you're either trolling or have serious self-destructive self-sabotaging tendencies.
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Old 02-18-2012, 12:44 PM   #14
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Quote:
Originally Posted by 18psi View Post
weeks before dyno = do nothing, car runs ok
day before dyno = hey lets swap parts and re-wire stuff

you're either trolling or have serious self-destructive self-sabotaging tendencies.
This is news?
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