Question for all who have put FD Alternators in FC's
07-31-12, 09:30 PM
#27
Holy thread ressuuuuurrecttttion 
Took me a while to find some thread like this
ok, I got an Alternator off Ebay(yea, I know) from ACE Alternator, someone here have them before and said they're good, so yeah, I got one, said it was reman and upgraded to 140amp.
Ok, installed, dimmed idiot light when key to on engine still off. I remember when I had the original alternator, which clearly fails at charging (less than 12 V!) had really bright light
I wonder if this Alternator is broken. I know I can test it but after reading HOZZMANRX7's results, I think I might have a "bad" Alternator cuz all my idiots lights were dimmed(before the engine start, just key on)
I probably gonna yank the CPU out and resolder everything first, right ?
Any inputs anyone ?
Took me a while to find some thread like this
ok, I got an Alternator off Ebay(yea, I know) from ACE Alternator, someone here have them before and said they're good, so yeah, I got one, said it was reman and upgraded to 140amp.
Ok, installed, dimmed idiot light when key to on engine still off. I remember when I had the original alternator, which clearly fails at charging (less than 12 V!) had really bright light
I wonder if this Alternator is broken. I know I can test it but after reading HOZZMANRX7's results, I think I might have a "bad" Alternator cuz all my idiots lights were dimmed(before the engine start, just key on)
I probably gonna yank the CPU out and resolder everything first, right ?
Any inputs anyone ?
07-31-12, 09:55 PM
#29
You might require a different pulley for the alternator. Might be wrong, but a stock pulley tends to be rather meager at producing proper voltage when at idle. I thought Japan to LA provides a pulley to correct this problem though I'm not really familiar w/this setup.
08-01-12, 12:16 AM
#30
Driving RX7's since 1979
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"said it was reman and upgraded to 140amp. "
I just saw this, and that comment is the "tell".
Satch hit it right. Every alternator I've seen that was "Upgraded" to higher amps would show lower volts at idle every thing else being the same. That upgrade needs a small pulley to increase the alternator's rpm's to more than stock at low idle.
On top of that, sounds like a crappy regulator leaking too much voltage at ground like I kept running into was installed.
I suggest you simply bag that upgraded alternator and go the relative drop-in FD alternator route. At least half the battle will be won right away. And if you're lucky, both. Although truth be told, dim idiot lights at initial key on isn't necessarily an indicator the alternator itself won't be charging properly.
Satch hit it right. Every alternator I've seen that was "Upgraded" to higher amps would show lower volts at idle every thing else being the same. That upgrade needs a small pulley to increase the alternator's rpm's to more than stock at low idle.
On top of that, sounds like a crappy regulator leaking too much voltage at ground like I kept running into was installed.
I suggest you simply bag that upgraded alternator and go the relative drop-in FD alternator route. At least half the battle will be won right away. And if you're lucky, both. Although truth be told, dim idiot lights at initial key on isn't necessarily an indicator the alternator itself won't be charging properly.
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