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

 

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?

 

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.

 

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

 

If the amp, added to the normal draw of the vehicles accesories outdraws what the alt can produce............yep

 

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.

 

Hi Uncle.......nice to "meet" you!!
Didn't the choke get its power from the Oil Pressure circuit back in olden times????

 

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