Originally Posted by Razoo
Could be your Alt, or voltage regulator. Get the code so you know what your dealing with. Could be something as simple as idle.
Just go by an Auto Zone or similar parts box store. The will usually run the codes for you for free, and give you a print out of it. Of course, they will also, most likely, have the part or bits you need to correct the situation.
the old school way is easyier and you can do it in your driveway
take a jumper wire and stick in in the a and b ports on your obd1 port under the dash turn yoru engine on not to start then your check engine light will flash 12 meaining your cpu is working
then all codes after that will be 13-80 somthing
theres a thread on here somewhere on how to do it