Thanks for the reply. In regards to my first question. I'm showing 10 volts on my volt meter, but my altenator is putting out 14 volts, and my battery is fully charged, and I have a check engine light. I pulled the alt. and had it tested, its good. I put it all back together, fired it up, all good, 14 volts at the meter, and no check engine light. Shut the engine off to clean up, and when I fired it up again I get 10 volts on the meter and a check engine light. Any ideas?