I have found two option, the Planr Power new approved alternator and the Barmstormers STC. This is what I found: The Plae Power alternator is a complete kit with a 50 amp alternator, voltage regulator, overvoltage protection, wiring harness and STC for the Ercoupe. The price at Aircraft Spruce is $712.00 with free shipping. Other iems needed are a 50 amp circuit breaker $20.00 and I would also add a voltmeter. Barnstormers offoers only an STC for $100.00 (not 85) and the parts costs currently come to about $500 for the alternator (used, rebuilt) $150.00 for the regulator, and approximately $50 for the rest of the parts needed, giving a total of about $800. You have to look for these parts, If you have a source of good used parts, the Barnstormer way may be the way to go, but if you want a complete kit in one package I suggest you look into the Plane Power conversion. Tom Couper 3989H
