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12-07-2006, 05:23 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Amp gauge pegs
Has anyone experienced the voltage gauge pegging on 50 amps? It seems as if the regulator?, is trying to have the alternator charge a severely discharged battery even though the battery is fine. The condition is intermittent, fine one moment, then sudden load on the alternator and the belt squeals away.
Any points to first check would be appreciated. 
Last edited by greg schroeder; 12-08-2006 at 12:22 PM..
Reason: word correct
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12-07-2006, 06:01 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,979
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Not Ranked
That would be the Ammeter not a voltage guage. I would pull the alternator and have it tested.
__________________
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12-07-2006, 06:23 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Check the regulator(remote mounted), one of the sets of points in it are probably burned and sticking, causing it to violently overcharge. I had the same thing happen at the WSCB in May and had to hike a couple of miles on foot from the hotel to get a replacement regulator at the NAPA store. If it is an internally regulated alternator, it needs to be replaced (if the regulator part cannot be serviced separately) before some wiring gets cooked.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 12-07-2006 at 06:27 PM..
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12-07-2006, 06:26 PM
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Banned
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Join Date: Oct 2003
Location: Yorba Linda,
CA
Cobra Make, Engine: SPF w/392CI stroker
Posts: 3,293
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Not Ranked
Way to go, Greg. Scorch the track, run a high 10, and you tweak your charging system in the process. 
Easier than half-shafts. 
-Dean |
12-07-2006, 08:14 PM
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Senior Club Cobra Member
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Join Date: Jan 2004
Location: St. Louis,
Mo.
Cobra Make, Engine: 427 S.O. Dual Quad / Cobra undecided
Posts: 1,380
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Not Ranked
Also check and make sure the guage itself is properly grounded or if the ground wire to the guage might be loose, this happened on Smiths fuel guage in a Healy I used to have and drove me nuts till I finally figured it out.
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12-07-2006, 09:38 PM
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CC Member
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Join Date: Feb 2006
Location: Wickenburg,
AZ
Cobra Make, Engine: SPF 2370, Dark Silver, Roush 402R
Posts: 118
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Not Ranked
Your Roush motor should have a voltage regulator in the alternator, thus you should bypass (disconnect) the SPF's voltage regulator. My ammeter does the same thing. I just don't worry about it because it's intermittent. If you want to do something about it, there's something on the SCOF tech. site about how to damp it out. Probably caused by the rapid switching of the solid state regulator, I hear. I freaked out the first time I saw it - but there seems to be no adverse effects (so far). Everything's fine after about 5K mi.
Tom
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12-07-2006, 09:41 PM
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CC Member
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Join Date: Feb 2006
Location: Wickenburg,
AZ
Cobra Make, Engine: SPF 2370, Dark Silver, Roush 402R
Posts: 118
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...or put in a voltmeter.
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I love it when a plan falls apart.
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12-08-2006, 10:52 AM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Quote:
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Originally Posted by Rick Parker
Check the regulator(remote mounted), one of the sets of points in it are probably burned and sticking, causing it to violently overcharge. I had the same thing happen at the WSCB in May and had to hike a couple of miles on foot from the hotel to get a replacement regulator at the NAPA store. If it is an internally regulated alternator, it needs to be replaced (if the regulator part cannot be serviced separately) before some wiring gets cooked.
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The alternator has one wire. Would this be an indication if it is internally regulated?
Would anyone have a picture of the remote type regulator on a Superformance and/or know the approximate location to find it?
I found the associated diode in the fuse block. |
12-08-2006, 09:32 PM
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CC Member
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Join Date: Feb 2006
Location: Wickenburg,
AZ
Cobra Make, Engine: SPF 2370, Dark Silver, Roush 402R
Posts: 118
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Not Ranked
My Roush came with a 1-wire, so I suspect yours did too. It's internally regulated. I suspect that's where the problem with the jumpy ammeter arises. There's information on SCOF tech about how to install it and protect your car's wiring harness.
Tom
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I love it when a plan falls apart.
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12-09-2006, 02:52 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
This is my alternator.
Powermaster |
12-09-2006, 03:37 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Quote:
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Originally Posted by ttmb
My Roush came with a 1-wire, so I suspect yours did too. It's internally regulated. I suspect that's where the problem with the jumpy ammeter arises. There's information on SCOF tech about how to install it and protect your car's wiring harness.
Tom
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I'm a bit lost on the SCOF site. Maybe I'm just slow.
Last edited by greg schroeder; 12-09-2006 at 03:42 PM..
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12-09-2006, 04:37 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Quote:
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Originally Posted by greg schroeder
I'm a bit lost on the SCOF site. Maybe I'm just slow.
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I e-mailed and a reply was quick. I figured out some stuff. Thanks SCOF |
12-12-2006, 02:09 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Quote:
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Originally Posted by greg schroeder
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Correction, sorry
According to Roush this would be the alternator on a 427R. It looks to be a GM alternator.
Powermaster 17294
I've now researched the problem.
The single wire from alternator in a round about way goes into amp gauge and then out to battery. The full load is being sent through the amp gauge. All that I talked with, including Powermaster, said don't do that.
My problem more than likely began because the wire out of the amp gauge going to the battery was loose and connected and disconnected at random. According to Powermaster when the wire is disconnected from the battery this is what spikes the gauge. It's a bad condition which is very hard on the voltage regulator inside the alternator.
My alternator tested to be delivering 15.8 volts. The internal voltage regulator is fried.
I ordered a new Powermaster 17294 from Summit. I'll install it and give a report as to the result soon. I'm reasonably confident this will resolve the issue. I'm going to bypass the amp gauge and use a volt gauge instead.
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12-12-2006, 06:13 PM
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CC Member
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Join Date: Mar 2002
Location: Benton,
AR
Cobra Make, Engine:
Posts: 48
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Neutral
One work of caution, a 100 amp alternater can set a 50 amp ammeter on fire.
__________________
Age and knowledge don't always come together. Sometimes you just get the age...
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12-13-2006, 07:54 AM
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CC Member
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Join Date: Aug 2000
Location: Germantown, TN,
Cobra Make, Engine: Superformance #770, Stroked 351W (393 cubes) w/ Tremec TKO-600, 3.27 Torsen locker, 'Hi-Tech' Blue w/ White Stripes, Wilwoods, Bilstein coil overs...and a big ear-to-ear grin!
Posts: 1,147
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If it doesn't set it on fire...it'll sure make life ...er....ah......."interesting" ...for a while... Bzzzzzt....POP......sizzzzzzzzz......POP...!
...and you needn't ask how we know these little tidbits of information... trust me...
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12-13-2006, 05:00 PM
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CC Member
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Join Date: Mar 2002
Location: Benton,
AR
Cobra Make, Engine:
Posts: 48
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Yes, I also speak from experience.
__________________
Age and knowledge don't always come together. Sometimes you just get the age...
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12-18-2006, 04:57 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
The new alternator with new internal regulator works. I'm guessing my problem began due to a loose connection on the amp gauge. With it off it will destroy the alternator's internal regulator.
The Roush 427R does in fact have a Chevy type Powermaster 17294. It's a 105 amp alternator running through the 50 amp gauge. The alternator should never need to go all out given the equipment on the car, but if you have discharged battery the situation might not be good. The length of 10 gauge wire that runs all over the place probably isn't the best either.
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