Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Phone call is extra charge. But what is new engine model number? What wires are in question? Newer engine probably has a voltage regulator, where old engine had a charge diode. And new engine may have a solenoid in the carburetor.??
I see question is still open.????