I still have an orange box I bought back in 1992 with the conversion kit they sold. Its been in at least 6 different cars over the years and still going strong. Its the new ones that have the high failure rate. They use a TO-220 transistor instead of the HD TO-3. They have a dummy TO-3 mounted on them to deceive you. The TO-220 package handles much less current and im sure its the cause of all these failures.