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07-30-2001, 02:41 PM
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#1 |
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347ci of HORSE POWER!!!
Join Date: Jul 2001
Location: Houston, TX
Posts: 1,416
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Low Charging
Hey, I need help. I have a 1992 Mustang GT 5.0. It is heavly modified. I also have a aftermarket stero system with all the bells and whistles. I just recently purchased a 140amp alternator to charge my battery. When my car is running over 1000RPM, the battery amp gauge shows it is getting a good charge. When my car is a idle (600RPM), teh gauge drops! In addition, my stero will cut out if it is cranked up. I installed the alt. exactly the way the instructions said to and it came with a computer print out showing the test results before they sent it to me. I thought that it was my underdrive pulleys so I put the stock one back on and it still gives me the same problem. How do I get my alt. charging to it fullest when my pony is a idle?
------------------ Cyberstang5.0 1992 Mustang GT 5.0 |
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07-30-2001, 03:40 PM
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#2 |
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Registered Member
Join Date: May 2001
Location: madison, WI
Posts: 70
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I had a similar problem with a different car.
Make sure you have a good ground for your amps. Are you running multiple amps for your system? Are they all grounded at the same spot? If yes to both make sure it's a proper ground. ------------------ 1990 GT 5k Original miles!! Ripper,Pullies,73 MM C&l Mass Air,9mm Wires,Piaa Headlights,MAC Cold Air (Fender) |
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07-30-2001, 04:14 PM
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#3 |
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347ci of HORSE POWER!!!
Join Date: Jul 2001
Location: Houston, TX
Posts: 1,416
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Yeah, I only have one amp for my subs and it is grounded good with a 8 gauge wire. I don't think that is the problem. I think it is something in the engine compartment. What else do you think it might be?
------------------ Cyberstang5.0 1992 Mustang GT 5.0 |
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07-31-2001, 10:13 AM
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#4 |
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Mustang Maniac
Join Date: Sep 2000
Location: GA, U.S.A
Posts: 2,266
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Do lights flicker? (doesn't really matter though)
Could be the voltage regulator not allow alternator to properly charge battery. But I assume you have internal regulator in alt so maybe not. You can go to Auto Zone and they should be able to give you a FREE electrical systems diagnostic (includes alt, battery, volt. regulator). ----------------------------------------- 351W-powered 1979 Ford Mustang notchback Stock 5.8L under 4" cowl, C4 w/ shift kit Holley 750 cfm, Edelbrock Performer RPM intake 1 5/8" MAC shorty headers, Al driveshaft 2.5" Off road H-pipe, 2-chamber Flowmasters Front: 225/60/15, Rear: 255/60/15 Eagle GT II Weld wheels (15x6;15x8), 8.8" Rear w/ 3.55s 14 x 4” K&N air filter (getting the Xtreme setup someday)  "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body |
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07-31-2001, 10:17 AM
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#5 |
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347ci of HORSE POWER!!!
Join Date: Jul 2001
Location: Houston, TX
Posts: 1,416
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The lights dim at ldle but that is it. They turn on bright when my car is above idle. I will check out Autozone. Thanx
------------------ Cyberstang5.0 1992 Mustang GT 5.0 |
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