electrical headache alternator


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Old 01-03-07, 07:31 PM
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Unhappy electrical headache alternator

have brand new alt on 1985 pontiac parisienne,. light on dash stays on. please help me locate my problem.
 

Last edited by boneyj; 01-03-07 at 10:00 PM.
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Old 01-03-07, 07:45 PM
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Test light time..........There should be 12 volts at the big wire in the back 12 V at the red wire in the side plug..........and 12 V WITH THE KEY ON at the brown wire..........Missing any of that???? If so, you have a wire chase........If not you have a non functioning alt
 
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Old 01-03-07, 08:02 PM
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Unhappy oh shoot!!

Originally Posted by wrench47
Test light time..........There should be 12 volts at the big wire in the back 12 V at the red wire in the side plug..........and 12 V WITH THE KEY ON at the brown wire..........Missing any of that???? If so, you have a wire chase........If not you have a non functioning alt


thank you i was afraid of that ,. also could a big stereo amp cause this problem?
 
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Old 01-03-07, 08:22 PM
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You stereo amp is probably draining your battery faster then the alt can charge it. Think about upgrading alt, adding a amp capacitor, or upgrading to a yellowtop battery.

To test this, disconnect your amp power cable from battery, and drive around for awhile and see if the light comes on, if it does, you have a wiring problem, or the alternator and/or battery is bad.
 
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Old 01-03-07, 08:24 PM
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Also, what are you doing with a "high powered" amp in a 85 Pontiac? lol
 
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Old 01-03-07, 08:24 PM
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If the amp, added to the normal draw of the vehicles accesories outdraws what the alt can produce............yep
 
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Old 01-03-07, 08:27 PM
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1985 huh......

If I remember correctly, the thin brown wire at the alt. also feeds the electric Choke? There may be a "Choke " relay under the dash. It Looks like a Horn relay , but it will be Green in color. A wiring diagram is the hot ticket here.
 
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Old 01-03-07, 08:36 PM
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Hi Uncle.......nice to "meet" you!!
Didn't the choke get its power from the Oil Pressure circuit back in olden times????
 
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Old 01-03-07, 09:01 PM
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Smile gotta be bigger & better

Originally Posted by HotinOKC
Also, what are you doing with a "high powered" amp in a 85 Pontiac? lol


its my nephews car hes trying to pimp his hoopty.lol
 
 

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