I once had a customer with a 5000 who insisted on continuing to replace his generators and regulators. Later, he had me coming out and changing them, thinking he was doing something wrong. My "repairs" would always last for only a short while, and then he would be back on the phone. By the time we had replaced every charging system related piece multiple times, he was starting to get frustrated with ME. And yes, I was polarizing the generator every time.
Finally I had had enough, and told him to convert. When he hesitated, I then told him to go find someone else to work on it - I simply refused to. From then on, I arm twisted nearly every customer who ever had a problem with that nightmare system from hell to make the conversion. Most agreed with me and did it.