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01-24-2009
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Alternator
What alternator options do we have, new 90 has a voltage jump with the turn signal on and tonight volts dropped significantly with the headlights turned on.
LGAFF 92 #234 90 #966 |
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01-24-2009
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#2 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,157
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Re: Alternator
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CS-144 it a stout Alt.. no sense to change to something other then the OEM replacement when replacing it.
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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01-24-2009
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#3 |
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,406
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Re: Alternator
i know i am going to get greif over this but it has been a great alt. for 5 years .i got an autolight rebuild from kragens for 140
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01-25-2009
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#4 |
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,667
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Re: Alternator
A local alternator and starter rebuild guy here in DesPlaines rebuilds mine for $95 with 1 year warranty.
Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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01-25-2009
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#5 | |
Join Date: May 2008
Location: USA
Posts: 1,093
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Re: Alternator
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Agreed, rebuild your original 
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01-25-2009
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#6 |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,466
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Re: Alternator - Not so fast thar!
Could very well be the alternator. That said, I wouldn't rule out a connection, at this point. Just to eliminate possibly having to dig out the alternator, I'd wanna see what the voltage was at the battery with the turn signal on, and then the lights. Normally, it should be around 14.7 VDC (cold). If the alternator/regulator is going south, voltage will be "something" other than a steady 14.7ish with the lights and or the turn signal on.
How-some-ever, if there is a ground or B+ connector issue in the wire harness between the battery and the various ciricuits, the voltage at the battery will remain more or less constant while the voltage (on the other side of the fault) will drop significantly. It may well be the alternator/regulator, but I'd wanna see voltage fluctuate at the battery before I pulled the alt. Just my 2¢ - and prolly not worth that!  P. |
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01-25-2009
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#7 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Alternator - Not so fast thar!
The voltage is fine, until the turn signal comes on....drops to 12 and back to 14.7 as it blinks. When headlights come on there is a major drop down to 10 or 11.
LGAFF 90 #966/92 #234 |
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01-25-2009
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#8 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,157
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Re: Alternator - Not so fast thar!
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__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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01-25-2009
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#9 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Alternator
No but it s holding a charge....I guess I will check it out, but I would think it is the alternator.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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01-25-2009
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#10 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,157
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Re: Alternator
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Start simple..... Also how do you know the actual voltages? are you using the highly calibrated OEM dash gauge?? 
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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