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Author
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Topic: Low Voltage???
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30Tunes
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Member # 8105
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posted
 
 
Ok so I noticed my volts were low so I just got a yellow top and nothings changed. It's 2 bars above 8v which is the lowest it can go on the gauge. It goes up when I give it gas and than drops back down. When the volts are at a regular level it runs great though.... someone said a voltage regulator, any help??
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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SmokinLX
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Member # 1684
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posted
You can take Your alternator into an auto parts store and have it checked out for free.
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Dont claim power if ya cant mile per hour. 10 second AOD
Posts: 4388 | From: East Bay | Registered: Aug 2002
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30Tunes
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Member # 8105
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posted
I pulled the battery off while it was running and it still ran the same.
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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93coupessp
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Member # 8418
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posted
Use a real volt gauge on the batt while running it will tell you the truth stock gauges can be fubar
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89 gt project
09 f250 diesel 605hp
14 cts-v
13 harley fxdb 103ci
Posts: 1919 | From: Hell | Registered: May 2008
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30Tunes
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Member # 8105
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posted
The gauge seem to be working correctly. The way the needle moves is relative to how the car runs. example- I turn the lights on, the voltage goes lower and idle is worse.
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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93coupessp
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Member # 8418
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posted
Yea I get that the gauge works but the calibration of it might not be correct like the needle points to 8 volts on the gauge when really it should be at 12v. It's just a cheap diognostic before you spend $90 on an alternator. So two things to your charging system battery and alternator you replaced one already it's still the same I say weak alt. you don't have like under drive pulleys without the correct alt pulpy do you?
Other thing to check. There is a fuse for the alt in the fuse panel under the dash should be a 20 this is what sends a signal to the reg on the alt from the ignition if it's popped the alt doesn't work
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89 gt project
09 f250 diesel 605hp
14 cts-v
13 harley fxdb 103ci
Posts: 1919 | From: Hell | Registered: May 2008
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30Tunes
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Member # 8105
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posted
All fuses work perfectly, just checked that and I do have underdrive pulleys. I'm not sure if the one I have is the correct one though.
I pulled the battery while it was running and it continued to run. The alternator is working.
[ December 26, 2011, 06:25 PM: Message edited by: TonyToons707 ]
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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93coupessp
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Member # 8418
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posted
Just cause the car runs when you do that doesn't mean the alt isn't weak. Go have it tested are if it produces the correct volts if it does I would look into those pulleys
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89 gt project
09 f250 diesel 605hp
14 cts-v
13 harley fxdb 103ci
Posts: 1919 | From: Hell | Registered: May 2008
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30Tunes
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Member # 8105
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posted
Did some research.... Says the o2 is probably the cause of the low voltage and stumbling idle. I then tracked down the wires and found the previous owner made his own 'wire extensions' to compensate for the long tube headers
![[Eek!]](eek.gif)
I am going to run my obd tester on it and see what codes it pulls up, no check engine lights are on at this point but that don't mean squat. Any more suggestions are welcome!
ANYONE SELLING O2 SENSOR WIRES (LONGTUBE LENGTH)
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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COPFITY
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Member # 1845
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posted
sorry i didnt read this whole thread.. but did you test the battery with a volt meter while the engine is running to verify 12 volts from the alternator?
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'92 Mustang LX Coupe
-Procharger P600
'71 Camaro Project
'97 Saturn SL1(saving the planet)
Posts: 884 | From: Pittsburg CA... No "H" cuz we don't hate! | Registered: Sep 2002
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COPFITY
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Member # 1845
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posted
also u can always jump the diagnostic connector by the driver side firewall and use a test light to see if there any codes
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'92 Mustang LX Coupe
-Procharger P600
'71 Camaro Project
'97 Saturn SL1(saving the planet)
Posts: 884 | From: Pittsburg CA... No "H" cuz we don't hate! | Registered: Sep 2002
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30Tunes
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Member # 8105
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posted
I just bought a brand new red top optima battery so I'm sure the battery is ok. I was talking with my boy from a shop and he says hell bet his last dollar its the o2 sensors. Again, any more suggestions are welcome.
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SUCCESS ONLY COMES BEFORE WORK IN THE DICTIONARY
1991 Calypso Green Notch
1993 Cobra Clone - SOLD
Posts: 829 | From: Bay Area | Registered: Dec 2007
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