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#1059373 - 10/11/18 02:13 PM Alternator Recommendations  
Joined: May 2016
Posts: 466
Witness86SS Offline
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Witness86SS  Offline
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Joined: May 2016
Posts: 466
Hatfield, PA
I'm on my 3rd alternator in 2 years and I think it went. I couldn't get the voltage above 10 volts the other night and it was sputtering hard at moderate RPM's

Considering a $200 chrome powermaster CS130 style 140 amp.

Currently running a failing $31 rock auto remanufacture CS130 105 amp. It did the job but i could bog it down if i turned the right music up, had headlights and fans on etc.

I have electric fans and 2 heavy duty amps in the trunk, so i need a bit of juice flowing.

Thanks,


Justin
1986 Black SS
Upgrades: 350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler - Proforged Steering Kit - Astro Shaft - AR62 OUTLAW II Wheels - Energy Suspension Bushings - Bitflipper Chip - 87 ECM - Moog Springs and Ball Joints - Bilstein Shocks - Bucket Seats
#1059374 - 10/11/18 02:31 PM Re: Alternator Recommendations [Re: Witness86SS]  
Joined: Mar 2012
Posts: 682
MC96 Offline
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MC96  Offline
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Joined: Mar 2012
Posts: 682
St. Johns MI
Id say Powermaster but I think you pay for the name (not that it isnt quality stuff)

There are a few different sellers on eBay that seem to have good reviews around the web


86 SS
400SBC, 4l80e, MSD Atomic injection/trans controller, Tilt glass clip, all tubular arms, corvette brakes, 9" rear
In progress
#1059381 - 10/12/18 12:21 AM Re: Alternator Recommendations [Re: Witness86SS]  
Joined: May 2000
Posts: 1,547
BadSS Offline
15+ Year
BadSS  Offline
15+ Year
Member

Joined: May 2000
Posts: 1,547
Pearl, MS, 39208
I like to run AutoZone's Duralast limited lifetime alternators. I've been running them on my SS and other cars for about 35 years. Currently have the 108amp duralast for a 86 IROC with 305TPI on the 85SS now. I think I had to replace the original alternator with one around 1988 and think I replaced one in 1992 and again in 1998. Haven't driven it much since 1998 but do believe they'll swap it out if it goes bad. Plus, I always felt like it was a bit of insurance in case I was on the road somewhere and the alternator went out - you're usually not that far from an autozone.

Edit - I've always run two or three juice hog class AB amps in the car. The key is making sure you use a large gauge wire to ground the battery to frame (0-2ga), engine to frame (0-2ga), and at least a 4 gauge power wire from the back of the alternator to the battery if it's up front. Lights went from basically blinking on and off to barely flickering.

https://jlaudio.zendesk.com/hc/en-us/articles/204374080-The-Big-3-Wiring-Upgrade

#1059382 - 10/12/18 01:27 AM Re: Alternator Recommendations [Re: Witness86SS]  
Joined: Jul 2007
Posts: 550
Cos86SS Offline
10+ Year
Cos86SS  Offline
10+ Year
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Joined: Jul 2007
Posts: 550
Westfield, MA
I also use AutoZone's Duralast Alternators. Just replaced mine in July and was under warranty. I was lucky enough to have held on to the receipt because it did not show up on their computer. While trying to tighten the wire from the battery to the output of the alternator bolt/stud, it kept spinning in place and would not tighten. I returned it and they gave me another one. That one check out fine until this week. I just replaced this one on Monday because the regulator died. Output voltage dropped to 13V and this is without any load (no lights or blinkers). I drove the car to Autozone so they can see for themselves that it was not charging the battery and they confirmed it needed to be replaced. I am now on my 3rd alternator and wondering if their quality is going downhill. I guess I'll wait and see if this one will last. The original one before replacing it in July was close to 10 years old so hopefully I just had a string of back luck. The advantage is that replacements are free and I can now remove the alternator in less than 5 minutes.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1059388 - 10/12/18 07:21 PM Re: Alternator Recommendations [Re: Witness86SS]  
Joined: Dec 1999
Posts: 6,827
Z65_Paul Offline
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Z65_Paul  Offline

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Posts: 6,827
El Camino Village, CA
Justin,
The odd thing is the CS style alternator is supposed to be superior to the stock SI style, providing full output voltage at lower RPMs. I have a feeling what you're running into is not the lack of alternator current capacity, but an improper setup of the tickler circuit to get the CS alternator into charge mode at low RPM. The problem is the stock SS wiring / dash components do not provide sufficient resistance in the tickler circuit to kick the CS alternator into charge mode consistently. I ran into this when I first converted from SI to CS style. If you use a simple conversion harness that doesn't have resistance, you'll run into this. I did a bit of research back when I did my conversion and ended up inserting the proper resistance on the tickler circuit wire. I haven't had a problem since. Full voltage at low idle RPM. I covered this in my post in this CS to SI Conversion DIY thread:
http://www.montecarloss.com/community/ubbthreads.php?ubb=showflat&Number=493219#Post493219

Hope this helps.
PaulC


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#1059390 - 10/12/18 09:43 PM Re: Alternator Recommendations [Re: Witness86SS]  
Joined: May 2016
Posts: 466
Witness86SS Offline
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Witness86SS  Offline
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Joined: May 2016
Posts: 466
Hatfield, PA
I followed your guide and hooked it up with an adapter with the resistor. I need to investigate some more this weekend.

Strongly considering a wiring upgrade using some jumper cables. Wires to the trunk are thick but strands are thin cheap and brittle.


Justin
1986 Black SS
Upgrades: 350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler - Proforged Steering Kit - Astro Shaft - AR62 OUTLAW II Wheels - Energy Suspension Bushings - Bitflipper Chip - 87 ECM - Moog Springs and Ball Joints - Bilstein Shocks - Bucket Seats

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